When I TURN on my computer, it begins to boot and everything but then the screen goes black after only a few seconds. The monitor doesn't turn off, a display just doesn't show up. Likewise, the computer doesn't turn off either but keeps running. It is as if nothing is wrong except that the screen is completely black.

I know the monitor is CAPABLE of producing a display because when I turn it on, you can see the first boot-up display. I can press DEL and enter setup and toggle through all the settings there but I don't know what I'm doing. But once I exit this setup and allow the computer to boot up to enter windows, the screen goes blank and that's about it.

Up until this, my computer was acting a little strange. It was a little bit slow (but nothing ridiculous) and when I had several programs running, it would start this terrible ANNOYING alarm sound until I SHUT it off. I am pretty sure it was set to make the alarm when the temperature inside reached 120 degrees. So it was overheating for some reason.

Well, anyways, can someone offer any suggestions? Does anyone know of something I can do once I'm in the "setup" section before it boots up?Does it not shut down during the BIOS?

This may indicate a software problem. What have you done prior to the incident?

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and when I had several programs running, it would start this terrible annoying alarm sound until I shut it off.

I checked the temp and it was about 105 F upon start up.  I don't know if that is high or not for a computer.  

Once it's in this BIOS mode it seems fine.  But once I leave, the screen is blank.  

it goes blank before windows starts up