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Computer shut off suddenly and wont start back up


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16 replies to this topic

#1 thewhit

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Posted 06 June 2011 - 05:23 PM

While I was away from my computer, it shut off suddenly. Now it wont start back up, the lights won't even turn on. I've tried the power cords and vacuuming the inside with no response. The only light on the computer that turns on is a small green one on the back of the case. But when I try the power button it turns off again. The computer is compaq presario cq5110f. Let me know what other information you need.
Thanks a bunch

Edited by hamluis, 10 June 2011 - 09:14 AM.


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#2 Allan

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Posted 06 June 2011 - 05:25 PM

Do you hear fans spinning when you press the power button? Hard to be certain from here, but my first guess would be a bad power supply.

#3 thewhit

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Posted 06 June 2011 - 05:32 PM

No nothing happens. If its the power supply how can i fix it?

#4 Allan

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Posted 06 June 2011 - 05:45 PM

You'll need to replace the power supply. Not a big deal - lots of tutorials on the web.

#5 thewhit

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Posted 07 June 2011 - 03:42 PM

I replaced the power supply. The computer lights up and works but nothing connected to it does like the key board mouse or lcd screen

Edited by thewhit, 07 June 2011 - 03:50 PM.


#6 Eyesee

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Posted 07 June 2011 - 04:03 PM

Any beeps from the system?
If so, what is the pattern of them.
In the beginning there was the command line.

#7 Allan

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Posted 07 June 2011 - 04:10 PM

And do you now hear the fans power up?

#8 thewhit

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Posted 07 June 2011 - 05:19 PM

There are no beeps (the computer is a compaq btw) and the fans turn on but don't seem to be working very hard. Tried to boot up again with CD Rom unplugged and all external hardware unplugged, but no luck. Could my mobo have been fried when the PSU went out? how would I know?

#9 Allan

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Posted 07 June 2011 - 05:26 PM

I don't know. Hardware problems are very difficult to diagnose from a distance and it really isn't my strength. Hang around and let's see what others think.

#10 thewhit

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Posted 07 June 2011 - 06:21 PM

Thanks for your help so far but this problem doesnt seem to be solved yet

#11 jodav

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Posted 08 June 2011 - 06:41 AM

Have you connected the 4pin power connector from power supply to the motherboard (yellow and black wires) for the CPU, the system will not boot up if you have not.

Edited by jodav, 08 June 2011 - 06:47 AM.


#12 thewhit

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Posted 08 June 2011 - 09:46 AM

Yes everything is connected. im starting to suspect that the motherboard is broken.

#13 jodav

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Posted 08 June 2011 - 10:30 AM

Well it certainly does not look to good for the board.

What I would do is inspect the board thouroughly for indications of burn marks, bellowed or leaking capacitors etc. (take it out if you are comfortable)

If nothing obvious remove everything except.

one stick of memory.
the CPU and fan and its plug.
the keyboard

connect the monitor to on board graphics.
connect the 24 pin and 4pin ATX power connectors to the motherboard from the power supply.

All other internal and external hardware like hard drives, cards, dvd drives etc leave disconnected.

Then see if you can boot into the BIOS and take it from there.

#14 thewhit

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Posted 09 June 2011 - 10:12 AM

How can I remove things from the motherboard without damaging it? will i be able to put it back in and which part is which?

#15 RVE

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Posted 09 June 2011 - 11:15 AM

Most likely the power supply was the symptom, not the cause. You probably had an electrical surge which fried your psu and MOBO. Replacing the PSU got it to run on but part of your mobo are still SOL. Unfortunately i don't think there is much hope for it. Try removing everything including hard drives. (leave cpu in) Try to power up and listen for beep code. (goggle beep code "your computer model") Add ram and a video card (if video is not integrated. add components one by one to get it working. If no beep or sweeps it probably fried. Also, an FYI, NEVER vacuum out your computer. Normal vacuums have tons of static build up and can fri stuff. use compressed air in a can (not from compressor) or special pc vacuums that are static free.




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