Monitor showing startup screen and then goes blank. I there a fix?

You may have gotten a virus that is preventing the Windows Boot / Startup from running. If so, the only way to fix it without too much experience would be to put your original Windows CD in the drive and then power off the PC by pressing and holding the power on button till the power light goes out. Then power it back on. If I am right, the PC will come up with a screen that gives you the option to boot from CD. If so, select that option (be quick - it times out in about 10 seconds). When it boots up, it will come up in maintenance mode or "safe mode". You may need to get out your PC Manual or Windows Documentation to be able to use this. But if you see an option to "repair an existing Windows OS" or "Restore to a previous time" option. select one or the other and follow the prompts.

If on the other hand the PC does not come up with anything but the black screen again, you probably have something in your PC that has gone bad, like maybe a memory board.

Best of luck. If you can't figure it out from here, you will probably need "expert" help.