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Computer will not boot up


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11 replies to this topic

#1 MyKuL733

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Posted 10 September 2009 - 12:58 PM

My computer is two years old. I turned it off last Friday. When I returned on Monday, it would not turn on. The screen remains black and not even the BIOS is output to the screen - absolutely nothing appears on screen, there are no diagnostic beeps. The power supply works and all the fans turn on. I confirmed that my monitor and cable work with another computer. Replacing the video card with a brand new one did not change the behavior. The cpu is not fried and none of the capacitors seem to have failed.

I cleaned everything with compressed air, then disconnected everything except for RAM, video card, power switch, case speaker, and cpu. I then tried powering it on outside of the case...still nothing.

Could a dead CMOS battery cause this behavior? Is there something else I should try before scrapping my motherboard?

Thanks for any suggestions.

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#2 Eric RBA

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Posted 10 September 2009 - 02:47 PM

Make sure that your power supply is tightly plugged into the mobo?
I would never ask a person to do something that I wouldn't do myself.

#3 MyKuL733

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Posted 10 September 2009 - 02:59 PM

Yep, the first thing I checked were the connections. The cpu fan spins, so the mobo is receiving power.

#4 hamluis

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Posted 10 September 2009 - 03:08 PM

Try reseating the RAM?

Check the RAM slots for dust, etc. that might interfere with connectivity of the modules?

Louis

#5 MyKuL733

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Posted 10 September 2009 - 03:19 PM

Yep, tried reseating the RAM and video card. Even checked the cpu. Still nothing.

#6 Eric RBA

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Posted 10 September 2009 - 03:37 PM

I know you said you replaced the video card, but have you tried another monitor? I don't suspect that it's your HD because you'd at least get something telling you no system disk is seen.
I would never ask a person to do something that I wouldn't do myself.

#7 MyKuL733

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Posted 10 September 2009 - 03:43 PM

Yep, since my monitor/cable worked when I connected them to another computer...I figured there is nothing wrong with those parts. I've been using my monitor with my computer for over a year, but just to be sure...I hooked up my monitor/cable from a working station and got the same blank screen when I power it on - not even BIOS.

#8 duper

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Posted 11 September 2009 - 02:51 AM

First thing that struck me was the CMOS...try replacing the battery... you have to rule out everything...the next thing I am thinking is the PSU......

#9 Eric RBA

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Posted 11 September 2009 - 08:30 AM

First thing that struck me was the CMOS...try replacing the battery... you have to rule out everything...the next thing I am thinking is the PSU......


I agree on the CMOS battery. He did mention that he's getting power to the CPU and PSU fans so it's not likely the power supply.
I would never ask a person to do something that I wouldn't do myself.

#10 MyKuL733

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Posted 11 September 2009 - 12:14 PM

I thought a CMOS battery problem would at least result in error messages output to the screen or diagnostic beeps on startup? Has anyone personally seen where a dead CMOS battery resulted in not even reaching BIOS?

I swapped with a brand new PSU - same problem.

At this point it sounds like I can try a new CMOS battery, but if that doesn't fix it... game over.

Thanks for all the suggestions

#11 Eric RBA

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Posted 11 September 2009 - 03:48 PM

I just worked on a client computer this afternoon that was having some random performance issues and then suddenly rebooted without warning on me. Upon reboot I was confronted with an Intel screen (Intel mobo) that informed me of a CMOS bad checksum error. Then after I saved the BIOS settings and attempted to load Windows it went to a completely black screen. I think it's similar to your problem because at this point I get nothing from the PC I am working on, just the blank screen. It appears to be a dead mobo. I'm glad I had this problem today, maybe it shed some light on your problem.
I would never ask a person to do something that I wouldn't do myself.

#12 geewin

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Posted 12 September 2009 - 08:56 AM

Hi MiKuL733,
just saw your post, and immediately recognised the problem. See my thread titled 'Unable to start up PC' Posted Aug 22nd in Windows XP Home & Pro Forum. My post today gives the present state of play. Seem familiar???
Geoff




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