You could have any number of problems, ranging to easy to fix, to an OS (Operating System) error. Try these to see if you get any results:
Make sure that the computer is completely off, and remove all the connections from the back of it, including the keyboard. Take your hand and feel around the case for any unusually hot areas. On the back, there may be a warm spot near the power, but that is normal. While everything is still unplugged, very gently
, rotate it in different directions and listen for lose parts. If you hear anything when doing this, then do NOT
plug it back in. Post back, and I can walk you through some steps on how to safely open up your case.
If the computer has a floppy drive, you can try to start it up with a boot disk. Windows bootdisks
has boot disks for all windows OS.
About the monitor, have you tried a different one? If the light next to the power button does not come on, then it is possible that it is going out.
We are all curious like a cat. We wonder, we ask, we learn.
Please post back when a suggestion works, so that others may learn.