what went wrong?

greetings everyone...

so i switched on my comp one day... and just as it loaded to the WinXP graphic... the monitor's on/off light keeps blinking... & the comp just hanged there.

i decided to reformat my comp & see maybe that will do it... upon reformatting, things run smoothly until i wanted to install software, then the same problem occured.

now, when i switch on my comp, i wouldnt be able to get past the WinXP graphic. instead, the monitor's on/off light will blink... & the comp just hanged.

i wonder what's wrong with it?
any input is appreciated, thanks.

Step 1 - tell us specifically what kind of computer you are using.

Step 2 - tell us what kind of antivirus software you're running.

At a first glance, it sounds like a conflict issue with a certain software you tried installing - did it hang when you tried that same one the first time?