MBP won't boot without power adapter also problem when waking from sleep

Hi guys,
I have a MBP 2.8 GHz Intel Core 2 Duo with 4GB 1067 HHz DDR3
I have had this issue for a while now and done a lot of research to solve the problem, but not got anywhere...
I can't boot the mac without the magsafe attached. Also, I'm not sure it is a related issue, but if I close the lid on the computer, it goes to sleep fine, but when I lift the lid to begin working again, the screen is like an opaque white and I get a blocked loading bar at the bottom that takes an age to clear and then when the screen wakes up it take a while to become life again. I also had an issue with the motion sensor. When I moved it, It would send itself to sleep. The battery icon also displays an X in it and has done for a while.
To try and solve this I have:
• Reset the PRAM
• Reset the SMC
• Booted from disc and repaired permissions and made sure the disc was OK
• Bought an new official Apple battery
• And pretty much everything else I can think of and have read about.
A while a go (Whilst in warranty) I had a problem with the USB board thingy (The board that runs keyboard, tracker pad and USB etc). Not sure if that helps.
I am starting to think it is hardware (RAM maybe??).
Can anyone help??
Thanks in advance.

As an update...
I have now tried:
Erasing the HD and installing SL from scratch and then used Time Machine to put back my files and apps.
Guess what... No joy.
Can anyone actually help with this? I take it I am on my own in this 'Support' forum?
If anyone has any further suggestions that I might be able to try that would be wonderful. My head is getting quite sore now from banging it against the brick wall.
Thanks in advance

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My MBP doesn't remember my Time Capsule wireless network when waking from sleep

My MBP (OS 10.5.8) doesn't remember my Time Capsule wireless network when waking from sleep. Thus, every time my MBP wakes from sleep, I need to select the Airport icon in the upper menu bar, select "Join other network", enter SSID and password. This is very cumbersome. And, I never had this problem when I was using the ISP's provided wireless router/gateway/DSL modem. Adding the Time Capsule and using it to generate the wireless network has introduced this problem.
It appears that this problem has to do with the hidden SSID. I don't need the lecture on how hidden SSID provides no serious security benefit. That's why I have the WPA2 encryption. I'm interested in a solution that will allow the Time Capsule to generate the wireless network, maintain a hidden SSID, continue to use WPA2 encryption, but have my MBP recognzie and autoconnect to this network.
Solutions I've alread tried:
1. Open Network Preferences
2. Select Airport from left hand column (and ensure Airport is at top of that list)
3. Select Advanced
4. Delete all Preferred Networks.
5. Apply settings.
6. Restart computer
7. Return to Network Preferences and from Advanced page, manually add my network with hidden SSID and WPA2 password
This solution works fine as long as I don't take my computer elsewhere and connect to another network. As soon as my preferred networks list gets another network, my MBP stops finding my TC network. Since I take my laptop to a lot of places (it's a laptop, after all...) this is a problem.
As I say, prior to adding the TC on my network (and using it to generate the wireless network), my MBP had no problem keeping 50+ preferred network names/passwords in the Preferred Network list, but always automatically finding/connecting to my home network without the need to "Join other network." Thus, I assume the problem lies with the Time Capsule.
Any ideas?

LaPastenague, thanks for weighing in. Didn't know that the hidden SSID capability was not IEEE standardized, and thus different devices will handle hidden SSID differently. With my admittedly limited knowledge of how SSID/hidden SSID works, I'm still a little confused as to why my MBP would remember the generic router/gateway's hidden network, but struggle with the TC's hidden network.
To my knowledge, when an SSID is broadcast by a base station (Airport, wireless gateway, etc.), a connecting device (like a laptop, iPad, etc.) detects this broadcast--this would be a passive reception of this SSID signal.
When an SSID is hidden, the base station does not broadcast its identification. Rather, a connecting device must transmit the name, and when the base station recognizes the broadcast, the connection is made. That's what you do when you select "Join another network" and manually enter the SSID.
The idea with OS X's Network Preferences is that these steps, whether for hidden networks or broadcast SSIDs, become automated.
Where is the potential for a different chipset between the TC and the previously used wireless router/gateway to alter this functionality? Shouldn't the selection of an SSID by the MBP to broadcast to seek for a base station be a function solely on the MBP? And once broadcast by the MBP, the TC should detect and reply?
Basically, the MBP can connect to the hidden TC manually just fine. The MBP can connect to the old setup automatically just fine. The MBP cannot connect to the TC automatically. Aren't these automatic connection functions solely on the MBP?
I'll try un-hiding the network and re-verifying that the problem is exclusively with the hidden network.
Z

Since updating to Lion the iMac won't recognise the external hard drive (maxtor) when waking from sleep mode,

Hi All, Since updating to Lion, my imac won't recognise the ext HDD (Maxtor) when waking from sleep mode, I have tried another port, diisc utility (Ext HDD not listed in here) but nothing works. I now find that I have to restart the imac to get the drive recognised..which is fine until the imac goes into sleep mode then I lose the drive and have to restart etc etc.....anyone suffering same issue. The Ext Drive worked perfectly until the upgrade..

Thanks for this, and apologies for delay in replying...in between seeing your post I backed up the ext hdd to another mac and used the disc utility to erase and repair and then re mounted the ext hdd. OK. I have then tested the ext hdd being recognised when waking from sleep mode a few times and everything appears to be fine. If this doesn't work (long term) I will follow the instructions as you have suggested....
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When waking from "sleep" screen turns grey under the pointer and the computer is effectively dead. Have to hold power 'off' for five seconds to regain computer.

When waking from "sleep" the screen appears normal but, the pointer leaves a trail of grey as it moves and the whole screen will turn grey if I keep moving the pointer. The computer is effectively dead. Have to shut down by using power off for six seconds and then re-starting. I know little about computers!

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode.)

IBook G4 temporarily unresponsive when waking from sleep on AC power

Hi,
I've noticed that my iBook G4 (late 2004) is temporarily unresponsive when waking from sleep, after having slept and been awoken on AC power (with the battery removed). The computer wakes up, but does not respond to trackpad or keyboard inputs for a non-trivial amount of time (30 seconds or so). There are no problems when sleeping and waking with the battery plugged in. I remove the battery to try to maintain it at a constant 40% load to conserve battery capacity. I am running Mac OS X 10.4.6.
Does anyone have a clue what could be causing this weird behaviour?

And yes... everything is normal at wake-up.
The only other thing I'll add is that the iBook battery replaces the traditional on-board battery found in all Macs used to retain several key settings when a system is unplugged. Things like system time for example. I can only venture a guess that some key setting is being recalculated on wake-up from a no-battery sleep, and the process that reads keyboard input is frozen until that setting is restored.

My MacBook Pro won't reconnect to my Wi-FI automatically after waking from sleep mode

Hello, everyone. Since I updated to Yosemite, my MacBook Pro won't reconnect to my Wi-FI automatically after waking from sleep mode.
Does anyone know how to fix that?
Thanks in advance,
Arthur.

Hi, arthurpacifico.
Thank you for visiting Apple Support Communities.
Here are a couple troubleshooting steps that I would recommend trying to see if it corrects this issue.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Reset your computer’s PRAM
http://support.apple.com/kb/HT1379
If the issue persists, try the troubleshooting steps I have attached below.
Symptom: After restarting or waking from sleep, my computer might not connect to the Internet
After waking from sleep or starting up, your computer may not show that it is connected to a Wi-Fi network.
After start or wake, your computer may indicate that it is connected to a network, but does not connect to the Internet.
Solution
Use these steps if your computer does not automatically connect to your desired Wi-Fi network.
Check your TCP/IP settings in the Network pane of the System Preferences. Click the "Renew DHCP lease" button
Choose System Preferences from the Apple menu.
Choose Network from the View menu.
Select Wi-Fi, then click the Advanced button in the lower-left hand corner of the screen.
Click the TCP/IP tab from the top of the screen.
Click the "Renew DHCP lease" button.
Select the Wi-Fi tab and view your Preferred Networks list.
Select each network and click the minus sign to remove those networks from your Preferred Networks list.
Click OK and close the Network preferences.
Remove your stored network passwords using the Keychain Access Utility.Restart your computer.
Open Keychain Access from /Applications/Utilities. Your window will look like this:
Remove your AirPort network passwords from the login keychain: Select the "login" keychain from the Keychain sidebar. Click the "Kind" column to order the list of keychain items by their type. Remove all entries of the kind: "AirPort network password".
Remove your AirPort network passwords from the System keychain: Select the "System" keychain from the Keychain sidebar. Click the "Kind" column to order the list of keychain items by their type. Remove all entries of the kind: "AirPort network password".
Note: The above steps will remove your Wi-Fi network passwords. If you do not know them, or if your network does not use passwords to restrict access, you should contact your network administrator.
Join your Wi-Fi network. You will need to enter your password for your network again if it requires one.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/ht4628
Cheers,
Jason H.

Why my Mac won't connect automaticly to Wifi from boot or when waking from sleep?

Hi!
I have 2TB Time Capsule with bridged WiFi.
When I reboot or wake up my MBP from sleeping it won't connect automaticly to my Home WiFi network. I allways need to connect by hand. This problem has been in the Os X Lion and Os X Mountain Lion.
Any other WiFi networks don't have this problem, only with Time Capsule.
Time Capsule has 7.6.1 software and also older software's had this exact same problem
My MBP is:
2.3GHz Intel Core i5
8GB 1333 Mhz DDR3
And the WiFi chip is:
Card Type: AirPort Extreme (0x14E4, 0xD6)
Firmware Version: Broadcom BCM43xx 1.0 (5.106.98.81.20)
Does anybody else run in to this kind of problem?
Oh and everything else with WiFi is working normally (Phones, iPad's etc even PC's =) )

I was having this same issue with a brand new 2012 MacBook Air after updating to Mountain Lion and using an AirPort Extreme. Most times waking from sleep would result in a lockup as the system would continously try to find my network (the WiFi menu would just keep cycling). After going to 10.8.1 it still continued so I started looking at other possibilities. I noticed that the security setting on my AirPort Extreme (current generation) was set to WPA/WPA2. I changed it to WPA2 and the problem so far (2 days in a row) has gone away.

Leopard forgets color profiles when waking from sleep on MBP Santa Rosa

I have a 15" MBP Santa Rosa with a 22" Samsung external monitor. I performed a clean (erase and) install on my machine. Upon waking from sleep, the computer seems to have forgotten the color profiles loaded for the displays. To correct this, I open system preferences and then the display option. As soon as the display options are shown on the window, my MBP loads the correct profile. This has happened for both displays, though far more frequently on the external display. The profile for my Samsung was created using color calibration hardware/software but the MBP display is running the stock profile from Leopard.
Any thoughts? Has anyone else experienced this?

same issue here. also had it in tiger, but much more frequently in leopard. seems to be whenever my display wakes from sleep.
MBP 2.4 GHz SR purchased 6/07. also driving samsung 245bw external display (which has never been affected, unless perhaps my calibrated and default profiles aren't different enough for me to notice--the difference is severe on my built-in display).
console contains this:
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Con trast.monitorPanel/Contents/MacOS/Contrast and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Geo metry.monitorPanel/Contents/MacOS/Geometry. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Geo metry.monitorPanel/Contents/MacOS/Geometry.
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Geo metry.monitorPanel/Contents/MacOS/Geometry and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/VPT .monitorPanel/Contents/MacOS/VPT. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/VPT .monitorPanel/Contents/MacOS/VPT.
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/VPT .monitorPanel/Contents/MacOS/VPT and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Bez el.monitorPanel/Contents/MacOS/Bezel. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Bez el.monitorPanel/Contents/MacOS/Bezel.
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Bez el.monitorPanel/Contents/MacOS/Bezel and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Ext endedTouchSwitch.monitorPanel/Contents/MacOS/ExtendedTouchSwitch. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Ext endedTouchSwitch.monitorPanel/Contents/MacOS/ExtendedTouchSwitch.
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Ext endedTouchSwitch.monitorPanel/Contents/MacOS/ExtendedTouchSwitch and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Pow erMode.monitorPanel/Contents/MacOS/PowerMode. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Pow erMode.monitorPanel/Contents/MacOS/PowerMode.
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Pow erMode.monitorPanel/Contents/MacOS/PowerMode and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Aut horization.monitorPanel/Contents/MacOS/Authorization. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Aut horization.monitorPanel/Contents/MacOS/Authorization.
2/26/08 4:56:33 PM [[0x0-0xaf0af]].com.apple.systempreferences[[4593]] objc[[4593]]: Class O3Panel is implemented in both /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/Aut horization.monitorPanel/Contents/MacOS/Authorization and /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/TVO ptions.monitorPanel/Contents/MacOS/TVOptions. Using implementation from /System/Library/MonitorPanels/AppleDisplay.monitorPanels/Contents/Resources/TVO ptions.monitorPanel/Contents/MacOS/TVOptions.
Message was edited by: thomas jerde

Won't accept password when waking from sleep.

a client of mine is having an issue where her mac won't accept her password after waking from sleep. The same password works when she restarts. She has confirmed that caps lock is off. Any Ideas?
I left her a message trying to find out more details about her computer like OS version and stuff. Will update this when i hear from her.

She still hasn't returned my call, but i know that she is able to type. Whether its wifi keyboard or not I do not know.

MBP intermittently restarts when waking from sleep

I had this problem repeatedly which seemed to stop after I did a full battery of repair utilities with TTP6... When opening the lid after the MBP was asleep (various times, could be a matter of minutes or hours) it would restart, blue screen appears, sometimes even brings up the password screen (I do NOT have the sys prefs set to ask for a password either on restart or on resume from sleep!). It does not make the tone that occurs on restart or starting up, just see the screens change, then the desktop appears, see all the extensions loading on the top bar, dock appears, etc just like a start up or restart would occur but the process is faster overall. Battery level is fine, just randomly restarting. It happened again this evening. I have had some other peculiar issues with the MBP just restarting itself but on coming out of sleep seems by far and away the most common. I am befuddled as to what the problem might be. I'll also note, no peripherals attached. No 3rd party hardware upgrads, all original Apple stuff from initial purchase. Any suggestions on a troubleshooting process and feedback on potential severity of the issue would be greatly appreciated.

Well, it's been awhile since I reinstalled the system to purge it of any goofy files. So, I tried using my Snow Leopard install DVD which will not work!??!? I then tried using my Leopard DVD which will not allow me to reinstall the system either?!?? So, now I'm backing up to my G-Tech mini and I'm going to boot from that drive and wipe out the MBP internal drive, reinstall the OS and use setup assistant to import data from the backup drive. Something is clearly not right that goes above and beyond the weird sleep -> restart issue. Still interested in feedback if this clearly appears to be the result of something that I just don't understand?

Messages won't sign-in to gchat or aim after waking from sleep.

I have installed the Messages beta and occasionally I cannot connect to the Jabber or AIM servers for GChat and AIM. Sometimes I will be randomly booted from the servers while connected. Currently when I woke my computer from sleep I choose to connect and it won't do so.

Hi,
Some of this is to do with how fast an App can "wake" compared to how fast the Mac can re-establish the Internet connection.
The only clear method is to either use the Messages/iChat menu > Accounts and Untick then re-tick the ones you want to Login (fully) or the same Menu > Preferences and Untick "Use this account" then reselect to Login (Again)
10:48 PM Friday; March 9, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
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Power Mac G5 Shuts Down When Waking From Sleep

I picked up a Power Mac G5 for a song at work. It had OS X Tiger 10.4.11, 1 GB RAM and 160 GB HDD, I've since upgraded the RAM to 2 GB, the HDD to 1 TB, and installed OS X Leopard 10.5 from an install disk I had bought when it first came out, and then upgraded to 10.5.8. It works and does what I want it to do.
It refuses to wake up from sleep since I first brought it home.
When it goes to sleep, the power light pulses like it should. However, when I move the mouse or press a key, it does a hard shutdown imediately. I've explored the suggestions here and searched on the internet for a solution.
Here is what I have done:
1.     Unplugged everything but the keyboard and monitor
2.     Replaced the keyboard with another white one that had never been used
3.     Replaced the battery on the Logic Board
4.     Pressed the SMC button on the Logic Board
5.     Did a PRAM reset
6.     Erased, partitioned the disk, and reinstalled Leopard from scratch
There are no extra programs loaded, only Leopard and the programs that came with it.
I've changed the Energy Saver Preference Pane to never sleep:
This is not going to kill me if the best option is to never sleep.
Everyone have a nice day.
Boyd

Boyd Porter wrote:
It is on an APC ups, so it could be a flaky power supply. At least it doesn't do any spontaneous shutdowns, yet, so I can live with it. If it dies, I will buy a new MacMini.
I had a similar sporadic problem with my G5 on a UPS which was failing. The surge on wake was enough to sag the power causing the PSU to kill the power supply. The UPS finally tanked and getting a new one cured the problem. You might see how it reacts on normal mains power as an experiment.
Also, never underestimate the capacity of a G5 power supply to accumulate dust, which reminds me that it is time I blew out my power supply dust, since it's been about a year since the last cleaning.

MBP won't boot due to hard disk problem

I have a late 2008 which just started to have problems booting up.
The trouble started a week ago, when my MBP would shut down unexpectedly while I'm working(on battery power). When I tried to reboot from battery power it didn't work. However, it's not the issue of low battery level. I had plenty juice in the battery. So I attached to the mag safe power supply, it would boot up again.
On yesterday morning after another unexpected shut down, I plugged the mag saft back in and hope it would boot up again. Never again. It will alwasy stuck at the gray screen with a spinning circle. So I did quite a few standard checks such as booting from Snow Leopard install DVD, and run DiskUtility. It tells me my MBP Hard Drive has problems and can not be repaired. So I figure it's the HD problem. Now I just want to salvage some data off from that HD, get a new HD and start over again.
I tried to boot from DiskWarrior 4.2 DVD, it didn't boot up. It boot up fine with Snow Leopard DVD. So the optical drive works fine.
The HD is the Hitachi 7200rpm travelstar 250GB.
Any advice?

I totally agree with making a Super Duper copy of the drive before proceeding with anything else--that creates an exact copy of the problem drive so that everything is preserved. It would also create a duplicate that could be used to experiment with.
One way to do this is to get the replacement drive for the MBP and place it in an enclosure, maybe even using one of OWC's kits. The MBP's drive is already mounted on the Mac Pro's desktop, and the new drive in the enclosure can also be mounted on the MacPro's desktop and properly formatted using Disk Utility. Then Super Duper can be launched and used to copy the MBP's drive to the new drive. Once that's done, the OS could be reinstalled on the new drive and we would be able to see if that cured the password problem. Since Super Duper can make a bootable clone, we could see if the MBP would boot from it by plugging it into a MBP port and trying an option boot. If everything works, you can just install the new drive in the MBP.
Doing something like this does not touch the original MBP drive and its contents, so everything is preserved.
Just about any external drive would work for this purpose--it doesn't necessarily need to be the one that you intend to use as a replacement.
I agree that we don't really know for certain just what the fault is, but I think a Super Duper copy would be in order no matter how we go about doing the troubleshooting.

Boot Camp, Expose, Trackpad & Dock issues after waking from sleep 10.6.1

Hello,
Here's my setup:
13" MBP (Late 2009)
2.26 GHz Intel Core 2 Duo
2 GB 1067 MHz DDR3
500 GB HD (Seagate Momentus Non G-Force version)
OSX 10.6.1: 367 GB
Boot Camp MS Windows 7 RTM: 123 GB
All of this started yesterday. After pressing the power button to boot, the MBP would give me the Mac boot sound, and would not recognize that the "Option" key was depressed. This would cause the system to boot into Windows 7 due to the Boot Camp default setting. After trying to get the system to boot into OSX 5 times, I ended up changing the default boot OS to OSX. The MBP now boots into OSX, but still does not recognize the option key on bootup so it will boot into the Boot Camp default selection only.
The following Problems are plaguing my MBP after waking up from a sleep state when running OSX 10.6.1:
The trackpad is performing right clicks no matter how many fingers are used to click the trackpad.
The dock changes from the Un-Magnified setup to a Magnified setup.
Expose takes on average 1 to 2 seconds to switch from the tiled view back to a selected application. The animation is slow, and the windows are not properly displayed after selecting an application.
Except for the Option key not being recognized during boot, these problems go away if I restart, but come right back when the system enters the sleep mode. Help!!!
Andy

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether your problem is caused by third-party system modifications that load automatically at startup or login.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Missing sound + missing USB power (sometimes) from Thunderbolt Display when waking from sleep

Hi
Two problems - one of which is driving med crazy!!
Have the latest updates, and the display is connected to a MBA (mid 2011).
The two are almost alwayes connected, and every time I wake the MBA from sleep, the Thunderbold Display does not "support usb sound" - the sound options are only MBA and headphones. Only a restart will give me the option to use Thunderbolt as sound output: WHAT TO DO!?!?!!
Sometimes when waking from sleep the USB in the Display seems to be "off" - the will not charge my devices (iPhone, iPad etc.). Only reboot seems to fix this... I have seen this in other discussions but not found a permanent solution - any thoughts?

Same here but reinstalling OSX is a bit drastic. I solved the problem by deleting a preference.
Go to Macintosh HD then System then Library then Preference panes then Sound.prefPane
Delete Sound.prefPane (you need to type your password).
Logout or restart.
This has happend twice this week so WHY is this suddenly occurring?
Hi,
I found this solution in the forum, but I can't find it again. I had cut and pasted it into a text file, because it solved my problem. I just don't want to take any credit for it. It did work for me. I had no problems for 3-4 weeks with the monitor, I have had the sound problem since last Friday. Very frustrating.
BSGINC

MBP won't boot without power adapter also problem when waking from sleep

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