Wont start - black screen no beeps 1

[schase]

Ok heres one that has me scratching my head.

Its an older HP 761n.

Not long ago the Power Supply went out - got a new power supply and all chugged along happily. But at the same time the onboard Video also wouldn't initialize.

No problem, stuck in a PCI 4mb video card and all chugged along happily.

Then that card seemed to burn out - according to my friend who owns it the screen flashed a few times on booting up would get to the press F8 on loading windows2000 and reboot itself.

So I plugged in a AGP, computer came right up, figuring that the PCI video card burned out (it was an old card) the owner got a in-spec 4x agp and installed it. That one kept cycling also - even though she pressed VGA mode, it still wouldnt come up. She went into BIOS and disabled the onboard video - now here I'm a little fuzzy on not knowing exactly what she did in there. It then did a few cycles and wham nothing, black screen.

So now i've got it again, I tried a AGP card I have - nothing, I tried a different PCI card - nothing, we're talking no POST beeps, nothing visible at all on the screen. I cannot hear the harddrives spool up, but I think its not even getting to that point.

I cleared CMOS with the Jumper, still nothing, lights will turn on and off on the keyboard if I press capslock or numlock, and the fans in the case and power supply come on ok.

Any suggestions i've overlooked?


"Never underestimate the power of determination"

Stuart
A+, Net+

 

[Enkrypted]

Make sure that all the components are firmly seated in their respective slots and remove any additional components such as sound card, keyboard, mouse, etc.

If that still does nothing. try taking mobo out of case and "bench boot" it on a non-static conductive surface(static bag mobo came in)try to make sure you have additional parts to test with(i.e - power supply, memory, video card, cpu, even monitor). From their you should be able to get a good starting place on what the problem could be.

Enkrypted
A+

 

[mainegeek]

Have you accidently attached the monitor to the on-board video instead of the add on agp card?

 

[schase]

Checked all cards, everything but the Video i put in was onboard.

And Lincoln78 - I don't know for sure what she did, she claims she disabled it - but not sure. So I figured last ditch effort if a AGP didnt bring it up - a PCI would - but still nothing.

"Never underestimate the power of determination"

Stuart
A+, Net+

 

[Enkrypted]

When she disabled the on-board video, it would have been reenabled when you reset the BIOS.

Well if you checked the mobo and main items(CPU, memory, video card, psu) outside fo the case and still nothing, then it sounds like the mobo went bad.


Enkrypted
A+

 

[schase]

Thanks, yeah thats pretty much what I was guessing.

I don't have a different PC to test the CPU in, but the Power supply voltage is good, I pulled out the ram chips to see if I could at least get some post beeps. but still nothing.



"Never underestimate the power of determination"

Stuart
A+, Net+

 

[Wxguesser]

As memory can also cause this problem, try reseating the memory modules as well. If still no joy, I would guess the mobo is toast.

Jim W.