Dell Dimension E310 powers up but no boot. Bad mother board?

Consider a Dell Dimension E310 that powers up but will not boot. No video signal gets to the monitor. Diag lights 3 and 4 on the front are lit. That code indicates a memory problem.

I've tried replacing memory and clearing CMOS and unplugging devices etc but without success. I'm about to declare it a failed motherboard but I thought I'd ask if anyone has any other ideas?

I did clean a massive amount of dust from the cpu fan / heatsink but it didn't help.
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veedarAsked:
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nobusConnect With a Mentor Commented:
you can always try another (PCI ?) video card for testing
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
Usually when a computer boots up and you get no other activity other then the power supply fans spinning this usually means it a dead or faulty power supply. Does the computer get a POST with any beep codes? If you get nothing except power supply activity you might want to swap a Known working power supply and see if you get any further. Thats where I would start.
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PUNKYConnect With a Mentor Commented:
The motherboard might gone, but you can step by step to check in the link below:

http://northonline.northseattle.edu/dogs/DELL/UserGuide/messages.htm
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pratiganConnect With a Mentor Commented:
before I would call it a bad Mobo, I would first take the harddrive out and try it in another box first.  If the drive is good, then it sounds like a Mobo.  Also, remove all external cards from the board, disconnect all IDE cables and drives.  Then attempt power on, if it beeps once, then the board is ok and the problem is other hardware that you disconnected.  Serially reconnect and power up as you go about putting connections back on to isolate the bad connection.
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veedarAuthor Commented:
Thanks for the suggestions I'll try them tonight.

It appears to power up. The CPU fan spins. The LED on the CDROM lights up. The link lights on the NIC light up.  But no POST no beep codes no screen output.

Now if I take out all memory then I do get beep codes.

Do I need to get into BIOS/setup to configure  a PCI video card and disable the onboard video?  
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nobusCommented:
normally, it picks it up automatically.
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PUNKYCommented:
It wount hurt to do so :) just to take a look in bios to make sure!
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nobusCommented:
? ? if you disable onboard, and it does not pick up the new one, you have no video . . .
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veedarAuthor Commented:
Just to clarify I can not get into the bios. No signal at all gets to the monitor. No splash screen no display no nothing on the monitor. So in this case I'm thinking it may not be possible to add a PCI video card.  But I'll try to dig one up and see what happens.
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nobusCommented:
also, can you test the cpu on another board?
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veedarAuthor Commented:
I ended up replacing the motherboard now all is well.
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nobusCommented:
i suppose that would cure almost everything. . .
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