CQ50 dosen't boot, No display but Fan & Power,HDD Led On

My Compaq CQ50 105AU is not booting with no display. Fan, Power, HDD,Wi-Fi Leds are on. Caps & Num lock Led do not respond. I have tried following:
1. Hard reset (Pressing power button for 30sec, 60 sec and so on)
2. Removing CMOS battery, plugging it again and booting.
3. Removing RAM & plugging them in different slots
4. Removing HDD and booting
My laptop was showing this problem for some time. But I use to leave it without power for a period and it use to boot again. But now its not booting.
What can be the problem? Can a weak CMOS battery restrict booting or MOBO, GPU/CPU has problem?
Has anyone faced this problem before?

Hi @Vishesh1
Welcome to the HP Support Forums!
I understand that you are getting a blank or black display, on power up. I am happy to help.
Are there any flash codes at all when the computer locks up?
Troubleshooting Black Screen Displays with No Error Messages During Startup or Boot
Here are some other sources I found that may be helpful to you.
Resolving Problems with Notebook Displays (Windows 7 and Windows 8)
Diagnosing a Liquid Crystal Display (LCD) for Damage
Also the service guide: HP G50 Notebook PC and Compaq Presario CQ50 Notebook PC - Maintenance and Service Guide
may be of help, if you wish to check the display connections.
Let me know if any of this helped.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

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Hi all,
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Power Mac G4: Screen is Black, No Startup Tone, Drive Does Not Operate
The Power Mac G4 computer screen is black. The boot tone is not present, the drive does not operate, but the fan is running, and LED is lit.
This article covers repair procedures for authorized service providers on selected Apple products, but we have published them in the Knowledge Base for the general public for educational purposes. At this time, there are a limited number of repairs that a customer can perform and these are covered under the customer installable parts program http://www.info.apple.com/installparts. If you have not been authorized to perform these procedures, please contact Apple (800-APL-CARE in the USA) or your local authorized service provider to schedule a repair.
Symptom
The Power Mac G4 computer screen is black. The boot tone is not present, the drive does not operate, the fan is running, and LED is lit.
Affected Products
o Power Mac G4
o Macintosh Server G4
o Macintosh Server G4 with Mac OS X Server
Solution
DANGER! This procedure exposes you to high voltages that can result in death or serious injury. DO NOT ATTEMPT THIS PROCEDURE IF YOU HAVE NOT BEEN CERTIFIED AS AN APPLE-AUTHORIZED TECHNICIAN.
1. Power Mac G4 (PCI Graphics): Check jumper block at J25. Make sure jumper is correct color for processor type, includes all required inner metal clips, and is installed in correct direction. See "Processor Module" in Service Source Take Apart for more information.
2. Check video cable/card connections.
3. Reset the Cuda chip. Refer to article 95065: "Power Macintosh G4 (PCI Graphics): Resetting the Cuda Chip"
Solution
Press the Cuda reset button on the logic board to reset the Cuda chip. The Cuda reset button is located to the right of the battery. Note: If the computer still fails to power up, refer to article 95066: "Power Mac G4 (PCI Graphics): Resetting the Logic Board".
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Procedure
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3. Open the side access panel.
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5. Wait at least 10 minutes before replacing the battery.
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7. Reseat the processor module.
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http://docs.info.apple.com/article.html?artnum=95037
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b. Press the PMU reset switch (S1) once on the logic board. Do not press the PMU reset switch a second time because it could stop the PMU chip from responding.
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d. Run MacTest Pro and return the computer to the customer.
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9. Replace video card.
10. Replace processor module.
11. Replace logic board.
12. Replace the power supply.
It is always worth resetting the pram
as well by holding down alt-apple-p-r at the same time immediately after
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Hi,
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Hi,
Are you talking about the whole computer or just its fan (1 month old) ? Please contact HP directly to get help:
http://www8.hp.com/us/en/hp-information/summary/ww-contact-us.html
http://welcome.hp.com/country/w1/en/support.html
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BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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After reading and resetting everything with Keyboard I still get blank white screen on 2nd? page of boot. The only way I can boot to Mavericks is unplug power cord, push and hold power button while plugging power cord in. Fans run at full speed, machine boots then runs normal except the dvdrw will not . The mid 2011 IMAC had the same problem with LION. I changed hard drives, formatted, and installed a clean install of latest os x mavericks. Any help would be greatly appreciated.
EtreCheck version: 1.9.15 (52)
Report generated August 30, 2014 at 6:56:41 PM EDT
Hardware Information: ?
    iMac (21.5-inch, Mid 2011) (Verified)
    iMac - model: iMac12,1
    1 2.5 GHz Intel Core i5 CPU: 4 cores
    4 GB RAM
Video Information: ?
    AMD Radeon HD 6750M - VRAM: 512 MB
        iMac 1920 x 1080
System Software: ?
    OS X 10.9.4 (13E28) - Uptime: 0 days 0:16:53
Disk Information: ?
    ST3120026AS disk0 : (120.03 GB)
    S.M.A.R.T. Status: Verified
        EFI (disk0s1) <not mounted>: 209.7 MB
        Untitled (disk0s2) / [Startup]: 119.17 GB (87.12 GB free)
        Recovery HD (disk0s3) <not mounted>: 650 MB
    HL-DT-STDVDRW GA32N
USB Information: ?
    Apple Inc. FaceTime HD Camera (Built-in)
    CHICONY USB NetVista Full Width Keyboard
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
    Apple Internal Memory Card Reader
Thunderbolt Information: ?
    Apple Inc. thunderbolt_bus
Gatekeeper: ?
    Anywhere
Kernel Extensions: ?
    [loaded]    com.nvidia.CUDA (1.1.0) Support
    [loaded]    com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
    [loaded]    com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
    CUDA: Path: /System/Library/StartupItems/CUDA
    FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Launch Daemons: ?
    [loaded]    com.adobe.fpsaud.plist Support
    [running]    com.arcsoft.eservutil.plist Support
    [running]    com.bjango.istatmenusdaemon.plist Support
    [loaded]    com.oracle.java.Helper-Tool.plist Support
    [running]    com.sophos.autoupdate.plist Support
    [running]    com.sophos.configuration.plist Support
    [running]    com.sophos.intercheck.plist Support
    [running]    com.sophos.notification.plist Support
    [running]    com.sophos.scan.plist Support
    [running]    com.sophos.sxld.plist Support
    [running]    com.sophos.webd.plist Support
Launch Agents: ?
    [running]    com.arcsoft.esinter.plist Support
    [running]    com.bjango.istatmenusagent.plist Support
    [loaded]    com.nvidia.CUDASoftwareUpdate.plist Support
    [loaded]    com.oracle.java.Java-Updater.plist Support
    [running]    com.sophos.uiserver.plist Support
User Login Items: ?
    Macs Fan Control
    Firefox
Internet Plug-ins: ?
    FlashPlayer-10.6: Version: 14.0.0.176 - SDK 10.6 Support
    Flash Player: Version: 14.0.0.176 - SDK 10.6 Support
    QuickTime Plugin: Version: 7.7.3
    JavaAppletPlugin: Version: Java 7 Update 67 Check version
    Default Browser: Version: 537 - SDK 10.9
Audio Plug-ins: ?
    BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
    AirPlay: Version: 2.0 - SDK 10.9
    AppleAVBAudio: Version: 203.2 - SDK 10.9
    iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
    Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes: ?
    CUDA Preferences Support
    Fan Control Support
    Flash Player Support
    Java Support
Time Machine: ?
    Time Machine not configured!
Top Processes by CPU: ?
         1%    WindowServer
         1%    fontd
         0%    firefox
         0%    SystemUIServer
         0%    SophosWebIntelligence
Top Processes by Memory: ?
    229 MB    firefox
    156 MB    SophosScanD
    152 MB    InterCheck
    131 MB    com.apple.IconServicesAgent
    115 MB    SophosAntiVirus
Virtual Memory Information: ?
    424 MB    Free RAM
    1.53 GB    Active RAM
    1.37 GB    Inactive RAM
    699 MB    Wired RAM
    1.26 GB    Page-ins
    0 B    Page-outs

I'd start by getting rid of the following software responsible for these extensions.
Kernel Extensions: ?
    [loaded]    com.nvidia.CUDA (1.1.0) Support
    [loaded]    com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
    [loaded]    com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
    CUDA: Path: /System/Library/StartupItems/CUDA
    FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Use the uninstaller provided with the Sophos software. You can uninstall CUDA via the preference pane. Be sure you remove the com.nvidia.CUDA extension which is located in the /System/Library/Extensions/ folder. Not sure if Fan Control has an uninstaller so you will have to do it manually:
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Applications may create preference files that are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application. In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder. You can also check there to see if the application has created a folder. You can also delete the folder that's in the Applications Support folder. Again, they don't do anything but take up disk space once the application is trashed.
Some applications may install a startupitem or a Log In item. Startupitems are usually installed in the /Library/StartupItems/ folder and less often in the /Home/Library/StartupItems/ folder. Log In Items are set in the Accounts preferences. Open System Preferences, click on the Accounts icon, then click on the LogIn Items tab. Locate the item in the list for the application you want to remove and click on the "-" button to delete it from the list.
Some software use startup daemons or agents that are a new feature of the OS. Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.
If an application installs any other files the best way to track them down is to do a Finder search using the application name or the developer name as the search term. Unfortunately Spotlight will not look in certain folders by default. You can modify Spotlight's behavior or use a third-party search utility, EasyFind, instead.
Some applications install a receipt in the /Library/Receipts/ folder. Usually with the same name as the program or the developer. The item generally has a ".pkg" extension. Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications. Here is a selection:
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    2. AppDelete
    3. Automaton
    4. Hazel
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Be sure to remove your two Login Items. Finally do this:
Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
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OS X Mavericks- Reinstall OS X
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This mini is operating OSX 10.6.8 and trying to update to Mountain Lion but upgrade stops and a black overscreen displays saying to power off and power on. The upgrade fails. What's the problem?

This mini is operating OSX 10.6.8 and trying to update to Mountain Lion but upgrade stops and a black overscreen displays saying to power off and power on. The upgrade fails. What's the problem?

Hi Fred,
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Select your Mac OS X volume.
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http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
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Intel D2700DC + Arch won't boot without display

I've faced really wierd (to me) problem running Arch as mini webserver on the Intel D2700DC mini-ITX board with Atom D2700 integrated and NM10 Express chipset.
I successfully installed the system, configured network and started sshd to continue setting up other services remotely via ssh console. Then I disconnected the keyboard and display from the case and put it under the table. After that I was quiet surprised that the system was not starting up anymore.
After some investigation I've found that the system is not booting if no display is attached to the DVI port of the motherboard. If I start the system with display disconnected, I can hear one beep that notifies about successful BIOS POST, HDD led blinks 2-3 times, and then just nothing happens. System isn't booting up. If I attach the display right after that - nothing is seen on the screen, and display is immediately falling into sleep mode. Keyboard is still active though, and if I press ctrl+alt+del - the system is restarting, and, if display was just connected, it boots ok then. Also it boots fine from the cold state if the display was attached to the DVI port at the time of powering on.
As I can assume from the timings and HDD led blinking, the boot process stops right after GRUB is loaded. There's nothing in system log, cause it seems that boot hangs just before the kernel is loaded by GRUB. I'm really stuck and don't know how to work around this situation, because if the display was disconnected when system was powered on - then there's no way to see anything on the screen until next reboot, and if the display was connected - then the system boots OK.
One more thing to notice:
There was an old CentOS installation on the HDD, to which I installed Arch Linux. I've tried to boot it once or twice before installing Arch, and, as I could remember, it could boot up without display connected, on the very same hardware. So I suppose it's definitely something in Arch that is preventing the system to boot without the display.
I guess that when no display is connected at boot time, NM10 chipset completely disables onboard video, and because of this we can't see anything on the display until the system is restarted. But this somehow affects Arch, so it can't boot without any video hardware present.
Last edited by rand256 (2012-05-10 10:23:28)

I'm afraid there's no such option, but it looks like arch isn't booting just because no graphics card is detected in the system when display it disabled during powering up.
There is a couple of similar topics about some other linux distros can't boot without video card inserted ([1], [2]) with some recommendations on what to do in such a case.
I've followed them - including enabling serial console in /etc/inittab, setting nomodeset in kernel line in grub's menu.lst, checking for enabled splash-screens... but that didn't help.
Does anyone know what options should be tuned in order to boot Arch without any active graphics card present in the system hardware?

IMac won't startup. Nothing but fan spinning. No Chime or screen

#15 inch flat screen iMac
I was re-installing the system software 10.2 from CD #1 and the computer stalled. When restarting I took the disc out -dumb in know.
Now the installation is incomplete and there is no disc in the computer.
The computer will not restart. I did get one chime once but never again. The screen is blank, and the computer will not even turn on now. The fan does go on, but the power light does not. I can't get the CD drawer open to put in a disc. I have been through the help notes online. But none of the normal things you do when starting up has worked. I have reset the PRAM and tried to start up in verbose mode and single user mode. When I tried that I got a long beep once but nothing. I have tried all the commands to open the CD tray, but I think it's a hardware thing now. Any ideas?

Does it have the original PRAM battery?
I would check it first. When mine went, I had no response from my Mac at all; just a light on my power button; absolutely no boot at all.
Check out things in Texas Mac Man's tutorial on the subject. His tutorial is a little dated (don't believe it even mentions G5's) but the info in it, except SMU not being included, still applies.
Anyway, there is a lot of things to try in the tutorial.
Here's mrtotes guide with pictures for working in the iMac.
Cheers!
DALE

Boot chimes sound but the screen stays dark - why?

Our iBook (16 VRAM) 700 has appeared to die. The normal boot chimes sound when the power switch is pressed (but only after a forced quit) but the screen stays dark and no hard drive activity can be heard.
Is this probably the "dreaded logic board video chip problem" I have read about in several places?
If so how do I rescue important files (like my wife's novel)!!! Strip the computer down and pull the hard drive? It was running Panther so there is no Time Machine backup.
Old Mac Oz

Have you tried starting up in Safe Mode? (This probably won't work, but it's worth a try.)
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[Y]ou can often fix this yourself by removing the iBook's bottom housing, and placing a shim of any sort, about 1mm to 1.5mm thick, onto the raised square on the bottom shield. I use a Scotch mounting square--you can get them in hardware stores and many grocery stores. When you reinstall the bottom case, it will press against this shim, which will press against the graphics chip, and may allow the chip to come into better contact with the logic board.
John Sawyer
CJS Macintosh Repair
Instructions for removing the lower case:
iFixit.com
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CQ50 dosen't boot, No display but Fan & Power,HDD Led On

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