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Cannot boot computer after power failure - HP PC Desktops

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Does it atleast turn on. and if not the something on the computer may have stop working probably the power supply.

Posted on Oct 28, 2008

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My dell optiplex gx620 does not start and it shows no. 3 and 4 lights illuminated on its front . what could be the problem.?


One of your memory chips is bad.

Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Diagnostic Lights caution.gif CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4"on the front or back panel. The lights can be off or green. When the computer starts normally, the patterns or codes on the lights change as the boot process completes. When the computer starts normally, the patterns or codes on the lights change as the boot process completes. If the POST portion of system boot completes successfully, all four lights display solid green. If the computer malfunctions during the POST process, the pattern displayed on the LEDs may help identify where in the process the computer halted.
note.gif NOTE: The orientation of the diagnostic lights may vary depending on the system type. The diagnostic lights can appear either vertical or horizontal.

Light Pattern

Problem Description

Suggested Resolution

tools011.jpg
The computer is in a normal "off" condition, or a possible pre-BIOS failure has occurred.
The diagnostic lights are not lit after the computer successfully boots to the operating system.
Plug the computer into a working electrical outlet and press the power button.

tools013.jpg
A possible BIOS failure has occurred; the computer is in the recovery mode.
Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.

tools012.jpg
A possible processor failure has occurred.
Reinstall the processor and restart the computer.

tools014.jpg
Memory modules are detected, but a memory failure has occurred.

  • If you have one memory module installed, reinstall it and restart the computer. (see "Memory" for instructions on how to remove and install memory modules.)
  • If you have two or more memory modules installed, remove the modules, reinstall one module, and then restart the computer. If the computer starts normally, reinstall an additional module. Continue until you have identified a faulty module or reinstalled all modules without error.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell.

tools015.jpg
A possible graphics card failure has occurred.
  • If the computer has a graphics card, remove the card, reinstall it, and then restart the computer.
  • If the problem still exists, install a graphics card that you know works and restart the computer.
  • If the problem persists or the computer has integrated graphics, contact Dell.

tools016.jpg
A possible floppy or hard drive failure has occurred.
Reseat all power and data cables and restart the computer.

tools018.jpg
A possible USB failure has occurred.
Reinstall all USB devices, check cable connections, and then restart the computer.

tools019.jpg
No memory modules are detected.
  • If you have one memory module installed, reinstall it and restart the computer. (see "Memory" for instructions on how to remove and install memory modules.)
  • If you have two or more memory modules installed, remove the modules, reinstall one module, and then restart the computer. If the computer starts normally, reinstall an additional module. Continue until you have identified a faulty module or reinstalled all modules without error.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell.

tools020.jpg
Memory modules are detected, but a memory configuration or compatibility error exists.

tools021.jpg
An other failure has occurred.
This pattern also displays during System Setup and may not indicate a problem.
  • Ensure that the cables are properly connected to the system board from the hard drive, CD drive, and DVD drive.
  • Check the computer message that appears on your monitor screen.
  • If the problem persists, contact Dell.

tools022.jpg
After POST is complete, all four diagnostic lights turn green briefly before turning off to indicate normal operating condition.
None.

Jun 06, 2012 | Dell OptiPlex GX620 PC Desktop

Tip

How to isolate issues between hardware and software


<p>It has been one of the dilemma of computer users is to identify what is really causing the failure in their computer. Often they think that they bought a defective product since they are getting these kind of errors in the computer. Having an error on your machine does not mean that the machine is defective or needs parts replacement. for all we know it might just need some simple troubleshooting steps to fix the issue. Here is a tip where you would be able to know if you need to bring your computer to a service shop for parts replacement or you can try to fix it at home by doing some troubleshooting steps that would help fix software failure in the computer system.<br /> <br /> On a Windows based operating system, you should always know when the issue happens. It will help much to observe your computer on how it boots up and what it does before you get to the desktop screen. Take a note on where and when exactly the error occurs.<br /> <br /><b> Power Failure:</b><br /> <br /> This is an issue where there are no lights on the power button of your computer, whether it is a portable system or a desktop computer. Obviously this is a hardware failure. surprisingly, discharging the flea power of your computer sometimes resolves these kinds of issues. Otherwise, you will definitely need to have a local technician look at your system for parts replacement.<br /> <br /><b> Note:</b> flea power is the charged power of our computer system. A computer system is made up of electronic components such as capacitors which hold electronic charges. To be able to discharge it, you should disconnect all power source from your computer and hold the power button for at least 5 seconds.<br /> <br /> <br /><b> POST Failure:</b><br /> <br /> POST is an abbreviation for Power On Self Test. as the name implies, it is the test that a system goes through to test the basic hardware components needed for a computer to boot. The components that it tests are as follows: Processor, BIOS (Motherboard), Memory, keyboard and video card. If there is a POST failure, the system would give you a black screen with lights on the front panel. Sometimes it will give you beeping sounds which would normally mean that you have a memory failure on your system. If you encounter such issue, you will need hardware technical support to guide you isolate further on what could be causing the failure.<br /> <br /><b> Boot Failure:</b><br /> <br /> Boot failure is when the computer is able to complete post. You will be able to know this if you hear a single beep on your computer. Isolating a boot failure from a post failure simply requires you to boot to the System Setup/configuration Screen (BIOS). If you are able to get to the BIOS, that means all the POST hardware component are good to go. However, booting to the BIOS differs per system. You just need to do trial and error on the following keys to tap as you turn your computer on.<br /> <br /> Del<br /> F1<br /> F2<br /> F10<br /> F9<br /> ESC<br /> <br /> To isolate an issue whether it is a software or a hardware issue, you just need to boot from the BIOS. If you are able to boot from the BIOS, chances are it is not a hardware failure and needs servicing.<br /> <br /> <p><img src="vincent_von_0.jpg" /><br /> <p><br /> If booting to the BIOS works, to further isolate the issue whether it is the advanced software, you need to boot to Safe mode. Safe mode is a troubleshooting state where only the basic applications and drivers are active. If you are having errors or boot failure, try to boot to Safe Mode. If you do not encounter the failure in Safe Mode, that means that there are advanced software being loaded in your operating system that fails. It is just a matter of knowing what that software is.<br /> <br /><b> Booting to Safe Mode:</b><br /> <br /> 1. turn computer on and tap on F8 before Windows starts.<br /> 2. You will be getting the Advanced Boot options. Use the arrow keys to get to the option for Safe Mode.<br /> <br /> <p><img src="vincent_von_0.png" /><br /> <p><br /> <p><br /><b> Safe Mode Definitions:</b><br /> <br /> Safe Mode: Just basic software are being loaded. Network drivers are not included which means no internet connection<br /> <br /> Safe Mode with Networking: Basic software and Network drivers are being loaded.<br /> <br /> note: for Vista or Windows 7, it includes wireless network drivers. This means that you can still connect to the internet with a wireless connection. In Windows XP, the wireless driver is not included even if you boot to Safe Mode with Networking<br /> <br /> Safe Mode with Command prompt: this is a troubleshooting state where you will be able to utilize DOS based commands.

on Jul 15, 2011 | PC Desktops

1 Answer

I got my motherboard changed in October and my computer won't boot up "disk boot failure 0" could I have the same problem again? I don't have a disk - dell dimension C521


The motherboard is not the problem.
Your hardisk is the problem.
See if your hardisk is detected during boot up procedure.
If it does... Run again your Windows XP CD installer and repair your operating system.
Having "Disk Boot Failure" error means the boot system of you operating system is corrupted.
If your hardisk is not detected... you better check if the power supply connector on your hardisk is secured and not loose..
If still not detected.. your hardisk crashed and need to be replace.

May 19, 2010 | PC Desktops

1 Answer

Power on emachine T6420 and moniter is blank. The moniter soon loses contact with the computer. The fan run and power is OK there is no beep code.


If you mean after the computer performs the self test the screen goes blank and stays blank, eventually turning off you are having a hard drive problem. When the computer boots you should see an E-Machines logo and/or a self test on the screen. That is done by the motherboard as part of every boot up. After that the motherboard passes control to your boot device and loads your operating system. If your computer stops booting at that point, your boot device is not working properly. That could be caused by many things - virus, hardware failure, power outage. If you really mean you see nothing at all on the screen when you press the power button your computer simply is not working at all. Open the case, blow all the dust out of it and reseat all components you can, then try again.

Jun 05, 2009 | E-Machines eMachines Desktop PC

3 Answers

Keyboard failure and diskette drive 0 seek failure


How old is the computer, could it still have warranty? USB ports are often protected with fuses. Some latest stuff has resetable fuses, but many are one-time that do not heal. Did you try the keyboard in the front USB's The thing of biggest concern though is that this happened in coincidence, meaning you may have a motherboard hardware failure. (the reason I mentioned warranty)

May 20, 2009 | Dell Dimension C521 PC Desktop

1 Answer

I have a hp pavilion a705w bout 12-30-04 it wont boot most times


That's because it has a failing power supply. I post this a lot. Why? Because 70% or more of computer failure, is directly related to the power supply. Next up is Electrolytic Capacitor failure on the motherboard, (The 'Caps' that surround the processor, more specifically. These are Voltage Regulators for the processor)

Then harddrive failure.

Many times you'll see a solution posted to use a Restoration disk, or System Restore. This is just a 'Band-Aid' approach. The power supply, for you, is the problem.

Apr 12, 2009 | HP Pavilion a705w PC Desktop

1 Answer

I have 2 GX520's that are buzzing when trying to boot


If your computer beeps during start-up:
  1. Write down the beep code
Code
Cause
1-1-2
Microprocessor register failure
1-1-3
NVRAM read/write failure
1-1-4
ROM BIOS checksum failure
1-2-1
Programmable interval timer failure
1-2-2
DMA initialization failure
1-2-3
DMA page register read/write failure
1-3
Video Memory test failure
1-3-1 through 2-4-4
Memory not being properly identified or used
3-1-1
Slave DMA register failure
3-1-2
Master DMA register failure
3-1-3
Master interrupt mask register failure
3-1-4
Slave interrupt mask register failure
3-2-2
Interrupt vector loading failure
3-2-4
Keyboard Controller test failure
3-3-1
NVRAM power loss
3-3-2
Invalid NVRAM configuration
3-3-4
Video Memory test failure
3-4-1
Screen initialization failure
3-4-2
Screen retrace failure
3-4-3
Search for video ROM failure
4-2-1
No timer tick
4-2-2
Shutdown failure
4-2-3
Gate A20 failure
4-2-4
Unexpected interrupt in protected mode
4-3-1
Memory failure above address 0FFFFh
4-3-3
Timer-chip counter 2 failure
4-3-4
Time-of-day clock stopped
4-4-1
Serial or parallel port test failure
4-4-2
Failure to decompress code to shadowed memory
4-4-3
Math-coprocessor test failure
4-4-4
Cache test failure

Apr 11, 2009 | Dell OptiPlex GX520 PC Desktop

1 Answer

Dell XPS 600 turns itself on to solid amber


Hi. the mother board seems to be having some initialization issues during boot up. this is common when the mother board is failing. i would check to make sure the battery on this board is working. if it is, the board my be ruined.
power board seems to be fine.
please rate and god bless.

Mar 17, 2009 | Dell XPS 600 PC Desktop

3 Answers

"Disc Boot Failure" upon powering up the compaq


your harddisk is not detected.
open your cpu case.
then reattch the power code and datacode to hard disk.

Nov 03, 2008 | Compaq Presario S6300NX PC Desktop

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