Computer doesn't turn on for longtime

Hello,
Hello,
I've my desktop computer for about two Years now. It is an Intel pentium dual core. yesterday I decided to restart it. However, once it turned off, it will no longer turn on and boot up.
The power button usually lights up, but now it does not. But, the decorative words "Aspire" at the bottom of the tower still lights up.
The screen is blank. I have made sure everything is plugged in, and tried plugging it into different outlets. I can't boot from a CD, the keyboard doesn't turn on and neither does the mouse.
As far as starting up goes, everything sounds normal. No beeps or clicks to hint at harddrive failure. Sometimes when I try to start it up nothing comes on but light bilnks in mouse for a second (the one that would run for only a few seconds) goes on full blast until I turn it off.
If everything seems to be going, what is stopping it from booting up?