Can't take screenshots when using external monitor

I used to take screenshots of areas of my screen all the time using Cmd-Shift-4 but, on my new Macbook Pro, if I have my external LCD screen connected, then any screenshot I take comes out as just a bunch of diagonal shading. It doesn't make a difference whether I take a whole or partial screenshot, and it's the same if I use the Grab utility or the shortcut keys.
If I disconnect the external monitor, screenshots work fine.
This is really frustrating, because I use the Cmd-Shift-4 all the time to collaborate with colleagues on designs.
Any idea if it's possible to fix this?
David

OK, this problem has vanished. The only thing I think it might be is that, when I check the colour profiles for each display, they're set to a combination I didn't try when I was trying to fix this issue ("Color LCD" for the laptop and "HW191D" for the external screen).
Anyway, it's working fine now, so I'm happy!

Similar Messages

How to blank laptop screen when using external monitor/

Hi there
I need some help with figuring out how to configure my xorg.conf for my Arch Linux 64 bit installation on a HP Pavilion dv 5000 laptop so that I can automatically blank my laptop screen when using an external monitor. I have Arch Linux installed along with Ubuntu Feisty. In Ubuntu my external monitor (Viewsonic 1912WB) was not detected at the time of installation but with the native 1280X800 resolution that is good for the laptop takes effect for the external monitor automatically when the external monitor is plugged in. The laptop monitor goes blank when the external monitor is plugged in.
In my Arch Linux installation I have not been able to configure a dual head configuration using the ATI Radeon drivers (fglrx). I have the native 1280X800 resolution set up for the laptop monitor and this resolution takes effect for the external monitor also. However the laptop monitor also continues to function when the external monitor is plugged in. I would like to blank the laptop monitor when using the external monitor.
I am attaching my Arch Linux xorg.conf and the Ubuntu xorg.conf below. Thanks for anyone who can help, I am having a lot of difficulty in figuring out how to set up xorg.conf among all the things that I have had to learn so far in Linux and I am a relative newcomer to the whole thing. I have tried to compare the two xorg.conf files and edit my Arch xorg.conf in accordance with the Ubuntu one but it did not work and I keep getting errors!
I am using XFCE as my Desktop environment.
Arch Linux xorg.conf
# File generated by xorgconfig.
# Copyright 2004 The X.Org Foundation
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# The X.Org Foundation BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
# OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# Except as contained in this notice, the name of The X.Org Foundation shall
# not be used in advertising or otherwise to promote the sale, use or other
# dealings in this Software without prior written authorization from
# The X.Org Foundation.
# Refer to the xorg.conf(5) man page for details about the format of
# this file.
# Module section -- this section is used to specify
# which dynamically loadable modules to load.
# Files section. This allows default font and rgb paths to be set
# Server flags section.
# Input devices
# Core keyboard's InputDevice section
# Core Pointer's InputDevice section
# Other input device sections
# this is optional and is required only if you
# are using extended input devices. This is for example only. Refer
# to the xorg.conf man page for a description of the options.
# Section "InputDevice"
# Identifier "Mouse2"
# Driver "mouse"
# Option "Protocol" "MouseMan"
# Option "Device" "/dev/mouse2"
# EndSection
# Section "InputDevice"
# Identifier "spaceball"
# Driver "magellan"
# Option "Device" "/dev/cua0"
# EndSection
# Section "InputDevice"
# Identifier "spaceball2"
# Driver "spaceorb"
# Option "Device" "/dev/cua0"
# EndSection
# Section "InputDevice"
# Identifier "touchscreen0"
# Driver "microtouch"
# Option "Device" "/dev/ttyS0"
# Option "MinX" "1412"
# Option "MaxX" "15184"
# Option "MinY" "15372"
# Option "MaxY" "1230"
# Option "ScreenNumber" "0"
# Option "ReportingMode" "Scaled"
# Option "ButtonNumber" "1"
# Option "SendCoreEvents"
# EndSection
# Section "InputDevice"
# Identifier "touchscreen1"
# Driver "elo2300"
# Option "Device" "/dev/ttyS0"
# Option "MinX" "231"
# Option "MaxX" "3868"
# Option "MinY" "3858"
# Option "MaxY" "272"
# Option "ScreenNumber" "0"
# Option "ReportingMode" "Scaled"
# Option "ButtonThreshold" "17"
# Option "ButtonNumber" "1"
# Option "SendCoreEvents"
# EndSection
# Monitor section
# Any number of monitor sections may be present
# Graphics device section
# Any number of graphics device sections may be present
# Standard VGA Device:
# Device configured by xorgconfig:
# Screen sections
# Any number of screen sections may be present. Each describes
# the configuration of a single screen. A single specific screen section
# may be specified from the X server command line with the "-screen"
# option.
# ServerLayout sections.
# Any number of ServerLayout sections may be present. Each describes
# the way multiple screens are organised. A specific ServerLayout
# section may be specified from the X server command line with the
# "-layout" option. In the absence of this, the first section is used.
# When now ServerLayout section is present, the first Screen section
# is used alone.
# Section "DRI"
# Mode 0666
# EndSection
Section "ServerLayout"
# The Identifier line must be present
# Each Screen line specifies a Screen section name, and optionally
# the relative position of other screens. The four names after
# primary screen name are the screens to the top, bottom, left and right
# of the primary screen. In this example, screen 2 is located to the
# right of screen 1.
# Each InputDevice line specifies an InputDevice section name and
# optionally some options to specify the way the device is to be
# used. Those options include "CorePointer", "CoreKeyboard" and
# "SendCoreEvents".
Identifier "Simple Layout"
Screen 0 "aticonfig-Screen[0]" 0 0
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard1" "CoreKeyboard"
EndSection
Section "Files"
# The location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# RgbPath "/usr/share/X11/rgb"
# Multiple FontPath entries are allowed (which are concatenated together),
# as well as specifying multiple comma-separated entries in one FontPath
# command (or a combination of both methods)
# FontPath "/usr/share/fonts/TTF"
# FontPath "/usr/share/fonts/Type1"
# FontPath "/usr/lib/X11/fonts/local/"
# FontPath "/usr/lib/X11/fonts/misc/"
# FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
# FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
# FontPath "/usr/lib/X11/fonts/Speedo/"
# FontPath "/usr/lib/X11/fonts/Type1/"
# FontPath "/usr/lib/X11/fonts/TrueType/"
# FontPath "/usr/lib/X11/fonts/freefont/"
# FontPath "/usr/lib/X11/fonts/75dpi/"
# FontPath "/usr/lib/X11/fonts/100dpi/"
# The module search path. The default path is shown here.
# ModulePath "/usr/lib/modules"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
EndSection
Section "Module"
# This loads the DBE extension module.
# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
# This loads the font modules
# Load "type1"
# This loads the GLX module
# Load "glx"
# This loads the DRI module
# Load "dri"
Load "dbe" # Double buffer extension
SubSection "extmod"
Option    "omit xfree86-dga" # don't initialise the DGA extension
EndSubSection
Load "freetype"
# Load "xtt"
EndSection
Section "InputDevice"
# For most OSs the protocol can be omitted (it defaults to "Standard").
# When using XQUEUE (only for SVR3 and SVR4, but not Solaris),
# uncomment the following line.
# Option "Protocol" "Xqueue"
# Option "Xleds" "1 2 3"
# Option "LeftAlt" "Meta"
# Option "RightAlt" "ModeShift"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc105"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# These are the default XKB settings for Xorg
# Option "XkbRules" "xorg"
# Option "XkbModel" "pc105"
# Option "XkbLayout" "us"
# Option "XkbVariant" ""
# Option "XkbOptions" ""
# Option "XkbDisable"
Identifier "Keyboard1"
Driver "kbd"
Option    "AutoRepeat" "500 30"
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
Option    "XkbRules" "xorg"
Option    "XkbModel" "pc104"
Option    "XkbLayout" "us"
EndSection
Section "InputDevice"
# Identifier and driver
# the following line.
# Option "Protocol" "Xqueue"
# Mouse-speed setting for PS/2 mouse.
# Option "Resolution" "256"
# Baudrate and SampleRate are only for some Logitech mice. In
# almost every case these lines should be omitted.
# Option "BaudRate" "9600"
# Option "SampleRate" "150"
# Mouse wheel mapping. Default is to map vertical wheel to buttons 4 & 5,
# horizontal wheel to buttons 6 & 7. Change if your mouse has more than
# 3 buttons and you need to map the wheel to different button ids to avoid
# conflicts.
# Emulate3Timeout is the timeout in milliseconds (default is 50ms)
# Option "Emulate3Buttons"
# Option "Emulate3Timeout" "50"
# ChordMiddle is an option for some 3-button Logitech mice
# Option "ChordMiddle"
Identifier "Mouse1"
Driver "mouse"
Option    "Protocol" "Auto" # Auto detect
Option    "Device" "/dev/input/mice"
# When using XQUEUE, comment out the above two lines, and uncomment
Option    "ZAxisMapping" "4 5 6 7"
# Emulate3Buttons is an option for 2-button mice
EndSection
Section "Monitor"
# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
# HorizSync 30-64 # multisync
# HorizSync 31.5, 35.2 # multiple fixed sync frequencies
# HorizSync 15-25, 30-50 # multiple ranges of sync frequencies
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
Identifier "My Monitor"
HorizSync 30.0 - 62.0
VertRefresh 50.0 - 70.0
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]"
Option    "VendorName" "ATI Proprietary Driver"
Option    "ModelName" "Generic Autodetecting Monitor"
Option    "DPMS" "true"
EndSection
Section "Device"
# The chipset line is optional in most cases. It can be used to override
# the driver's chipset detection, and should not normally be specified.
# Chipset "generic"
# The Driver line must be present. When using run-time loadable driver
# modules, this line instructs the server to load the specified driver
# module. Even when not using loadable driver modules, this line
# indicates which driver should interpret the information in this section.
# The BusID line is used to specify which of possibly multiple devices
# this section is intended for. When this line isn't present, a device
# section can only match up with the primary video device. For PCI
# devices a line like the following could be used. This line should not
# normally be included unless there is more than one video device
# intalled.
# BusID "PCI:0:10:0"
# VideoRam 256
# Clocks 25.2 28.3
Identifier "Standard VGA"
Driver "vga"
VendorName "Unknown"
BoardName "Unknown"
EndSection
Section "Device"
#VideoRam 131072
# Insert Clocks lines here if appropriate
Identifier "* Generic VESA compatible"
Driver "vesa"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]"
Driver "fglrx"
EndSection
Section "Screen"
Identifier "Screen 1"
Device "* Generic VESA compatible"
Monitor "My Monitor"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 8
Modes "1280x800" "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1280x800" "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x800" "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]"
Device "aticonfig-Device[0]"
Monitor "aticonfig-Monitor[0]"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Ubuntu xorg.conf
# /etc/X11/xorg.conf (xorg X Window System server configuration file)
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
# Edit this file with caution, and see the xorg.conf(5) manual page.
# (Type "man xorg.conf" at the shell prompt.)
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "Files"
FontPath "/usr/share/fonts/X11/misc"
FontPath "/usr/share/fonts/X11/cyrillic"
FontPath "/usr/share/fonts/X11/100dpi/:unscaled"
FontPath "/usr/share/fonts/X11/75dpi/:unscaled"
FontPath "/usr/share/fonts/X11/Type1"
FontPath "/usr/share/fonts/X11/100dpi"
FontPath "/usr/share/fonts/X11/75dpi"
# path to defoma fonts
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection
Section "Module"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "vbe"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "true"
EndSection
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "HorizScrollDelta" "0"
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "stylus"
Option "Device" "/dev/input/wacom"
Option "Type" "stylus"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "eraser"
Option "Device" "/dev/input/wacom"
Option "Type" "eraser"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "cursor"
Option "Device" "/dev/input/wacom"
Option "Type" "cursor"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection
Section "Device"
Identifier "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
Driver "ati"
BusID "PCI:1:5:0"
EndSection
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1280x800"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x800"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x800"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x800"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x800"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x800"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "stylus" "SendCoreEvents"
InputDevice "cursor" "SendCoreEvents"
InputDevice "eraser" "SendCoreEvents"
InputDevice "Synaptics Touchpad"
EndSection
Section "DRI"
Mode 0666
EndSection

Xrandr 1.2 provides means for this. But today the only supported configuration is xorg-server-1.3 + xf86-video-intel-2.0. So for Radeon you'll have to wait for drivers that support Randr 1.2.
On my laptop (Thinkpad x60s) that would be:
xrandr --output VGA --auto
xrandr --output LVDS --off

GS70 Stealth Pro Crashes when using external monitor..

Hi Guys,
I just bought a GS70 ghost pro a few weeks ago and have been loving it, no problems, running Battlefield 3 and watchdogs..
However I just bought an external monitor, Asus VG248QE, when i connected it via display port and tried to play Battlefield 3 on the external monitor the laptop crashed - both screens blank- fan on- power button went orange- had to hold down the power button to reset.
Tried it again, opened Bf3 in window mode, put it on external monitor, went to full screen - it played ok for a few minutes then the laptop crashed again..
I had played bf3 no problems on the laptop screen previously.
Anyone got any ideas what might be going on? I'm new to gaming on pc so I'm a bit lost, any suggestions would be welcome.
Thanks,
Dan

Which nvidia driver are you using? (latest one from nvidia GeFormce Experience or MSI website)
Try to use the one from MSI website and update the latest VBIOS(80.04.F7.00.0C).
http://www.msi.com/support/nb/GS70_2PE_Stealth_Pro.html#down-firmware&Win8.1 64
step by step guide:http://www.msi.com/files/pdf/VBIOS_Update_under_DOS_mode_EN.pdf
Can you check the CPU and GPU temperature under two situation? (1. when running without external monitor 2. using external monitor)

Macbook Pro 15 Late 11 extreme fans noise when using external monitor

Dear Apple, recently I bought Macbook Pro 15 Late 11. I really love it's speed and new OS X Lion, BUT this Macbook really noisy when I use external monitor and keyboard. I work on external monitor all the time. I don't care about how hot my Macbook is when I'm on external monitor. Let it just be hot and quiet.
P.S. Example. I run Ableton Live and have 6200 RPM working on external monitor (awfully loud!). CPU 90% idle. When I switch off external monitor and use internal one, RPM drops down to 4500 with the same Ableton work session. By the way, I don't need cool graphic card. Apple, let our work days be quiet.

I did that and it didn't help. It's common problem with an external monitor. Here are some links:
http://forums.macrumors.com/showthread.php?t=1162550
http://www.ivy-rose.co.uk/Articles/Macbook-Pro-Cooling-Issues

Internet running very slowly when using external monitor.

I've used my HDTV as an external monitor for my various MacBooks for years with no problems. I bought a 17-inch MacBook Pro, and it worked perfectly doing the same thing for the first few months that I had it. Recently it has started to have very poor Internet speed, but only when I connect it to my TV. The Internet and my Airport Extreme are not the cause, as no one else in the house has this issue and my iPad loads sites as fast as it ever has. Plus, the MacBook Pro in question has an excellent connection once I disconnect it from the external monitor.
What could be the cause of this? I updated to 10.7.2 way back when it was released and only had problems very recently. Is there anything I can do without having to take it to the Apple Store?

Are you sure that the internet is running slowly? Or, because you're using an external monitor, you're using more memory than before and you're having some issues with memory access? You can open Activity Monitor and see how much free memory you have.
One other thing. Are you using discrete video when you're connected to a monitor? Or are you using the integrated Intel HD3000 video.

Desktop acting weird when using External Monitor.

Hey guys,
Just wondering if people have been having this weird "problem" when using an external monitor on OS X Mavericks. Though not really an issue that makes the OS/Mac usable, it's more of a quality of life thing (and it's really annoying for someone who likes things to be where I put them).
Anyways, the problem is that when I use my external monitor when at home, I have it set as the main display while the monitor on my MacBook Pro 15" acts as the extended/secondary monitor. No problems in functionality, BUT, the icons on my desktop always move while my external monitor is in use.
I usually do my work while using my external monitor and I use my desktop as my initial location to save my work files before moving them to an appropriate folder. However, revert back to not using the external monitor, everything just gets muddled up on top of eachother, stuff (sometimes) get missplaced and it just becomes a hassle to rearrange my desktop to how it was before.
tl:dr: desktop icons move when I use my external monitor as my main display.
So does anyone know if this is a problem that can be fixed, or is it an issue my monitor being a 3rd party model and old?
(Monitor HP w2448h — http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay?ac .admitted=1391518927628.876444892.199480143&javax.portlet.begCacheTok=com.vignet te.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.pr p_ba847bafb2a2d782fcbb0710b053ce01=wsrp-navigationalState%3DdocId%253Demr_na-c01 482166-8%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.tpst=ba847bafb2a2d78 2fcbb0710b053ce01&sp4ts.oid=3454237)

Hi BradnBeaverton,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Whether or not you are using an Apple Cinema Display, the behaviour you are describing is the same:
Apple Cinema Display: Troubleshooting steps
http://support.apple.com/kb/HT2810
Desktop icons move after screen resolution change
Changing the screen resolution affects the display of information on your screen, especially changing to a smaller resolution. The operating system may automatically reposition icons after you change the screen resolution.
OS X Mountain Lion: About the Display pane of System Preferences
http://support.apple.com/kb/HT5369
Cheers,
- Judy

Macbook Chirps and clicks when using external monitor

My mid 2010 Macbook Pro makes chirping and clicking noises from the hard drive however it only happens when I have my external monitor hooked up. Any one have any idea why? It is different from the Motion sensor click. I've found all over the net that others are experiancing this issue (not connected to external monitor) however haven't I haven't seen a conclusion. Any ideas?
Thanks
Here is a video I just recorded of it http://www.youtube.com/watch?v=0ZAc9o3Z4Dc

Hello everyone!
I found this topic which took my attention as I've been having the same issue for some time..
Please excuse my bad english, I'm italian... but I'll try to point everything up the best I can.
Every time I hooked up my macbook pro 13" mid 2010 to the external monitor/TV. I started to hear my hard disk chirping and clicking...
That was worrying me a lot, thinking my hard disk was going to abandon me soon....
But I finally came to a solution!!
Well.. not really a solution, but certainly a workaround.
In my case my Mac is lying on the side of a 46" Led TV which I use also as a monitor for it, hooked up via HDMI cable and HDMI-MiniDV out Hama adapter. I was using a wifi connection.
Then I thought "could it be the wifi antenna disturbing the hard disk when the mac is closed?"
I connected my mac via LAN cable to the router, turned off the wifi, and... my Mac is now quiet as a frozen lake (and a lot faster too)!! ;D
Please let me know if that works for you too.
Cheers!

Caution when using external monitor

If my iStat pro is right my temperatures are too high when playing media with a external monitor and the laptop closed. I see 80 degrees Celsius. In my opinion this is much too close to the maximum operating temperature for me. Yes, the fan is running at 6000 rpm's and it stabilizes the temps to 70's but that's still pretty high. I think the problem is as the heat rises it hits the screen and has no where to go. With the screen open the heat can dissipate into the air. If you are using a external monitor with screen closed I would be interested in what your temps are under load.

I have never had a problem and it is a method that Apple has proscribed in their instructions for using in ClamShell mode.
Apple: How to use your PowerBook G4, MacBook or MacBook Pro with the display closed and a Bluetooth keyboard or mouse
Apple: How to use your PowerBook G4, MacBook Pro or MacBook with the display closed

How to switch off internal macbook screen when using external monitor(s)

as far as i observed, adding external displays ( running different screens on them, not mirroring) to a macbook pro increases the gpu workload and with that comes temperature rise in the laptop and increase in ventilator noise - and probably increased hardware aging and risk of component faillure due to high temperature inside the laptop.
simply try connecting two external 27" screens and open some flash video on both of them. then run a temperature monitoring software and watch temps rise, compared to running same flash videos / demanding tasks only on one connected external screen or only on the laptop screen with no external monitor connected.
especially in mavericks, due to its increased background routines, such a set-up appears ever the more taxing, then again who does not love apple`s nice adds showing laptops with two 27” screens connected to it and the workspace vision they invoke....
i have seen temps around 100° to 102° celsius on a 13" macbook pro 2012 edition, which i would expect is territory where the cpu / gpu temp safety switches will trigger system shutdown any time soon ( hardware status before verified as fully in order by apple service and default osx installation)
imagine your anti-virus software starting some realtime content screening while runnign some demanding tasks already and the system shuts down easily (all such situation observed in reality)
(would be interesting to see how a retina display macbook fares with 2 external monitors running demanding tasks, considering the retina display already increased taxing for the gpu - any experience from users of such a setup would be very much appreciated as it will provide critical purchase decision intelligence for all of us envisioning a retina-book and two big screens adoring our desks...)
turning down the macbook`s built-in screen`s backlight may reduce power consumption but i have not seen any evidence that it switches off the gpu-to-screen feed and respective gpu load - it certainly did not prevent gpu, cpu, board, etc temps to rise to borderline levels.
so the key question here is, how to switch off the macbook pro`s built-in screen in order to avoid gpu cycles being wasted on that screen ( and the resulting heat developments) when working with big external screen(s) connected to the laptop ?

this thread talks about running several monitors as advertised by apple and running demanding task on them.
with the lid open, the keyboard offers a very efficiant heat escape vector, which is blocked when the lid is closed - this is a basic and commonsense insulation effect. this thread also mentions the use of temperature monitoring software and thus a repeatable test setup. the temps recorded were also mentioned. they rose when the lid was closed, the running task remaining unchanged. as far as i could track down the cpus in discussion will shut down around the 105 degree celsius range. i observed system shut downs when the system approached 103° celsius. not to mention that the fans will run loud well before that.
again this is on hardware checked and ok-ed by apple service.
the question still welcoming an expert answer: is there any way to switch off the built-in macbook monitor while the lid is open ?

Noise when using external monitor

When I connect my MacBook Pro to an external LCD screen and also connect my soundoutput to an external amplifier I get noise in the speakers. What can I do to avoid this?
It gets even worse when using powercord on my MacBook.

this is caused by processor noise/power interference. one fix is to turn the volume all the way up on the macbook pro,and adjust volume on the amplifier.

17" crash when using external monitor.

Since I bought this powerbook back in mid January I have been having problems with the computer crashing whenever it is connected to an external monitor. Usually the problem happens in either safari or terminal and ALWAYS happens when I use my scroll mouse.
According to my system.log this is the error I receive once the computer crashes:
Feb 9 18:09:34 Aluminum kernel[0]: ATIRadeon9700::waitfor_rbspace: Overflowed block waiting for FIFO space. Have 2, need 8. RBBM_STATUS 0x8401c100
According to google this problem has been occurring since Panther.
http://www.google.com/search?client=safari&rls=en&q=waitfor_rbspace&ie=UTF-8&oe=UTF-8
I have done all the defacto mac troubleshooting (pram, permissions, sudo rm -rf /mach
So far my problem has still remained unresolved. I am wondering if anyone else is having this problem. If so what monitor are you using? Does this happen regardless of having an external monitor attached? Do any ADC members know if 10.4.5 is going to have any ATI updates? Please help.

Since I bought this powerbook back in mid January I have been having problems with the computer crashing whenever it is connected to an external monitor. Usually the problem happens in either safari or terminal and ALWAYS happens when I use my scroll mouse.
According to my system.log this is the error I receive once the computer crashes:
Feb 9 18:09:34 Aluminum kernel[0]: ATIRadeon9700::waitfor_rbspace: Overflowed block waiting for FIFO space. Have 2, need 8. RBBM_STATUS 0x8401c100
According to google this problem has been occurring since Panther.
http://www.google.com/search?client=safari&rls=en&q=waitfor_rbspace&ie=UTF-8&oe=UTF-8
I have done all the defacto mac troubleshooting (pram, permissions, sudo rm -rf /mach
So far my problem has still remained unresolved. I am wondering if anyone else is having this problem. If so what monitor are you using? Does this happen regardless of having an external monitor attached? Do any ADC members know if 10.4.5 is going to have any ATI updates? Please help.

No video when using external monitor and resuming from sleep.

I know some people were having problems with the new MacBooks, but I guess the Mac driver fixed something. However, when I'm in Windows and have my Dell 24" hooked up to the Mini DisplayPort -> DVI adapter, I cannot resume from sleep. The monitor will turn on, but I can't get an image on it.
In MacOS it seems to resume from sleep fine, but not in Windows. Anyone else seeing this?
Thanks!

Is no one else getting this error? Does anyone have any issues when their MacBook is hooked up to an external monitor and it goes to sleep?

Display problem when using external monitor

Got any ideas about this? My friend has extended his imac (intel) display to another monitor using the mini dvi to vga. He can't see a thing on the imac but the system is up. He see a faint outline of the windows on the imac but its really dark. The extended monitor is showing fine. He plugged it out, shut it down and all of that but the screen just does not display.

Same problem. I have always extended my monitor though. Today I went to lunch... came back... no display... I am using it right now though, I finally was able to figure out how to get the external monitor to act as a clone. The support guy said there wasn't a way to do this, but if you hit option F7 it will switch to clone, then you can go to the display settings and set the external monitor to have the white bar.
So its all functioning, but the laptop lcd is blank. Actually its just a white screen, which apparently is 'blank' though to me blank is black. It flickers and weird outlines show here and there.
The support guy was insistant it was a boot issue. But it can't be, everythign else works. Everywhere I look, there are people asking, and nobody from apple answering. He is sending me a box to send to support. 7-10 day turnaround... 7-10 days that I am going to be out of the water.
The support guy's computer crashed twice while I was on the phone with him.

HT2494 Reboot my Macbook Pro when using external monitor w Thunderbolt to VGA adapter

I have a Macbook Pro running 10.9.2 OS X (MacBookPro8,1). I never had any problem w that but yesterday i bought an external monitor (kind of old model from LG - L1900E). Well, i was trying to extend my Macbook Pro display through a Thunderbolt to VGA adapter. It worked at first but it started rebooting my Mac. I just disconnected that and the reboot stopped.
It sounds to me like a Software related BUG regarding connection or something strange.....
I would like to have some help on how to proceed w that ? Is there a specific SW i need to install to use that ?
I am kind of disapointed because i heard that one of the major items the new OS X was about external displays.....
Looking forward a help from an apple specialist, Tks !
Marcello H. Ishida.

Examine these instructions:
http://support.apple.com/kb/ht3131
Ciao.

Reboot my Macbook Pro when using external monitor w Thunderbolt to VGA adapter

I have a Macbook Pro running 10.9.2 OS X (MacBookPro8,1). I never had any problem w that but yesterday i bought an external monitor (kind of old model from LG - L1900E). Well, i was trying to extend my Macbook Pro display through a Thunderbolt to VGA adapter. It worked at first but it started rebooting my Mac. I just disconnected that and the reboot stopped.
It sounds to me like a Software related BUG regarding connection or something strange.....
I would like to have some help on how to proceed w that ? Is there a specific SW i need to install to use that ?
I am kind of disapointed because i heard that one of the major items the new OS X was about external displays.....
Looking forward a help from an apple specialist, Tks !
Marcello H. Ishida.

Examine these instructions:
http://support.apple.com/kb/ht3131
Ciao.

Can't take screenshots when using external monitor

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