Monitor acts like it isn't even hooked up

December 23, 2009 at 06:08:25
Specs: Windows XP
Sony VAIO powers up and POSTs as far as I can tell, but no video: Monitor works with other computers; video card (AGP) works in another computer, but different video card (PCI) doesn't work in the Sony. I guess my question is, is the problem in the P450-VX motherboard or the Pentium4 CPU?

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December 23, 2009 at 06:24:21
OK. You've confirmed your graphics card & monitor are good.

How are you determining that the system is POSTing?

Do you get a POST beep? If so then at least the CPU seems ok since without a functioning CPU you will get nothing.

If all you are getting is fans spinning and not much else you might have a faulty powersupply. PSUs provide several different voltage outputs on different rails. A failure on one rail can leave other devices getting power misleading you into thinking the unit is OK. Try another PSU.

Does the motherboard have onboard graphics or only the AGP card?

Goin' Fishin' (Some day)

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December 23, 2009 at 06:53:52
Hey, Richard, thanks for your response. I have to admit I can't recall now whether I got the beep, but everything seems normal except for the video as described. I have it torn down right now for cleaning, so as soon as I run to the geek store and get some more heatsink compound, I'll reassemble and try it again. No onboard graphics.

Thanks again for the help. I'll get back and let you know how it goes.

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December 23, 2009 at 07:58:18
Well, that was weird. I cleaned and reassembled this monster and it worked fine. I did see one likely problem when I tore it down: One of the connectors (4-pin) had a bit of discoloration on one of the pins as if it got a little overheated. The disassembly may have cleaned off some kind of heat-funk and re-established connection (?). I'll run it w/o its skin for a while and watch that connector. If that's the problem, then your PSU suggestion was spot on.

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