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Desktop has power but doesn't boot


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#1 monodefuego

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Posted 09 September 2015 - 09:26 AM

Hey there everybody.

 

I have a 2 year old desktop running Windows 7. It's worked perfectly, and was working perfectly when I left it last night. This morning I was surprised to find it shut down. When I turned the power on, it lit up like it's supposed to, the fans engaged, but I don't think I hear the hard drive spinning. The hardware on the desktop itself is functioning (the DVD tray opens, for example) but there is no output to any devices, so the monitor doesn't come on, the keyboard isn't on, etc. I've tried the obvious fixes (removing and resupplying power, checking external connections).

 

Any help is greatly appreciated. Thanks for taking the time to look. Sorry if I haven't included required information, I'm very much a layman.



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#2 mjd420nova

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Posted 09 September 2015 - 10:12 AM

The first step would be to eliminate any plugin cards and the drives.  Both 12 and 5 volt supplies are needed, but the 12 volt is mostly for the hard drive and optical drives.  With just the MOBO, onboard video if available, and keyboard to start.  If no display, the CPU is not starting.  I suspect the power supply is faulty.



#3 monodefuego

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Posted 11 September 2015 - 09:06 PM

First off, thank you for replying, I really appreciate it.

 

I just got done swapping out the power supply (I felt pretty confident about that explanation, too). Still has the same exact problem.

 

I've never tried to bypass a graphics card and boot with onboard video. I'll give that a try tonight.

 

In the meantime, though, it really doesn't sound like my CPU is starting. Is there any chance it could just be that I need to replace the CMOS battery, or am I probably looking at replacing the board?



#4 monodefuego

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Posted 11 September 2015 - 10:04 PM

Just removed the graphics card and tried to boot with onboard video. Same problem. That kind of leaves the CPU or the MOBO, right?



#5 mjd420nova

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Posted 12 September 2015 - 11:16 AM

MOBO or CPU, looks like that's the culprit.  CMOS battery failure shouldn't cause a complete failure to start but it can cause some very strange faults.



#6 hamluis

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Posted 12 September 2015 - 12:14 PM

The fact that the optical drive seems to work...makes me think that this is more video-related than MB or CPU...I would try a different monitor, first of all...to see if the problem replicates itself.

 

Louis






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