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Why does this happen?

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Whenever I turn on my computer my monitor doesn't "register" what I mean is , from a cold start I turn my monitor on first, (I have that red/blue/black box thing with spanish words written in it going up and down on my screen) but when I turn on my computer the monitor stays like that. I have to shut down my computer and wait a few seconds and turn it back on again. I have to do this like 3 or 4 times for the monitor too "register" windows. I hope you all can understand what I'm trying to say. I upgraded my video card a few weeks back but the card that Gateway sent me wasn't compatible with my pc so I had to exchange it for a 4x AGP card (the other one was 8x) I'm going to be getting another card around the first of the month that is a PCI card cause something overheated last night and I have read somewhere that the card I have (GeForce2 MX400 ) has a tendency to over heat, But I started getting this problem after I install the other card that was an 8x AGP card. Do you think that it screwed up my motherboard? Can anyone give me some ideas what to do?
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First, when you start your PC, and the monitor stays blank, are you certain it is on? Do you here the Windows startup sound?

What you describe could very well be a failing power supply. A PSU supplies three different voltages--12, 5 and 3.3.

If the 12 and 5 rails are working, but the 3.3 is not, you will get lights and motors (fans, drives) spinning, but no video or motherboard activity
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Read the article below on AGP 8X and 4x.

Reinsert the video card in the slot and reinstall teh drivers. Possible the slot is damaged while upgrading the video card.
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