|Ok, let's troubleshoot your PC.|
Unplug any usb, printer cord etc...just have the keyboard and mouse, video cable and power cord plugged in and try booting it up...also make sure there is NOTHING in your floppy drive or your CD drives.
DON'T use any wireless mouse or keyboard, use the ones that came with your PC.
1-When you power it up, do you see any lights flashing on your tower?
2-Can you hear the hard drive spinning?
3-Does the light on your monitor change from yellow to green?
4-Do you see the PC logo on the screen when you boot it up?
5-Does the black screen have a little dash in the left corner that blinks?
Some HELP in posting on Computing.net plus free progs and instructions Cheers