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Desktop Computer: No video output until it hits the desktop?

A desktop computer is not generating video until it reaches the Windows desktop, and it is taking ~30 more seconds to get there than usual. I can't see POST information at all because the monitor doesn't even get input until the OS loads completely, it sleeps until that point. Because of this I also can't get into the BIOS, or load safe mode. Basically I can't interact with the machine at all until it hits the Windows desktop. I have confirmed the problem is not the monitor. What could be causing this?

OS: Windows 7 final, dual-core Intel, 500GB HDD, 2GB RAM, 8800GT video.

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Well this is a first for me. All the post information and the splash screen is one of the first things you see on initial boot.
The nVidia 8800GT is more than good enough for that machine unless it has a fault with it.

What i suggest is remove the power cord from the back of the computer. Remove the side panel and disconnect the hard drive data cable from the motherboard.
Look on the motherboard for a coloured plastic jumper which is usually located near the CMOS battery, move it to the other position and hit the on/off button. That should clear the CMOS and reset the BIOS.

If there is no jumper that you can see take out the CMOS battery for no less that 10 minutes (or longer) periodically hitting the on/off button, that will clear any residual power from the motherboard.
Plug the power back in and see if you get a post/splash screen and see if you can enter the BIOS. If you can turn the computer back off and reconnect the data cable for the hard drive.

You say you have the final edition of Windows 7? I'm still beta testing the RC edition myself and i did have a problem with an ATI graphics card. I saw all the boot information but when it loaded the desktop it completely lost the signal. I installed an nVidia card and all's fine!! Strange but it could be related!!

Take out your graphics card, clean the brass contacts and the PCI Express slot of dust and reseat the card. See if that helps at all.

I'm interested in this problem you are having so please keep me informed as to your progress.

Good luck

Posted on Oct 01, 2009

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I am assuming your pc motherboard has an on-board vga port. If it DOES, you need to hook your monitor to that, and go into your BIOS, to select "ADD-ON VIDEO" or "ADD IN CARD" or "PCI-E SLOT Card" or something to that effect rather than "AUTO-DETECT" or "ON-BOARD". Make sure that on board video option is not selected, or that add in video card is selected as the first or primary device.
If your card does NOT have an on board vga port, you would have to contact the mfr of the board. The BIOS is not correctly handeling the card you have, and is attempting to use another vga port. If there are no other vga ports available, (yet your bios is attempting to use another one) that means there is a malfunction in the BIOS and you have to return the defective board.

Posted on Oct 01, 2009

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Is the input mode on your monitor set to AUTO, or did you manually set it to VGA (analog) or DVI (digital) ?

Posted on Oct 01, 2009

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