Aspire 5100 Won't boot!

Hope someone can help....The laptop has been working fine until yesterday...the screen froze and wouldn't let me use the mousepad/curser. I turned the machine off and rebooted, it won't reboot, reacts for about 2 seconds, screen stays black and nothing. Do you think my processor is shot or thoughts to possibly fix it?
Thanks allot for any help/suggestions

 

Start by removing battery and power, and all connected accessories, holding down the on switch for 30 secs then experiement with starting using adapter only and Battery only

 

Thanks BruBoo, tried everything you suggested...still nothing...when I turn the power on, it will stay on (both with battery and/or power cord), processor starts and reacts for about 2 seconds then stops and just won't boot...any further thoughts? Anyone? Appreciate your help!

 

So in the first 2 seconds the BIOS is checking MB voltages, Fan speeds, Memory and CPU /Chipset temperatures and discovering atttached disk and optical drives.

The first is not user fixable, If you are out of warranty
It may be worth opening the case, checking if the fan spins up and heatsink is firmly attached to CPU , checking if removing all but one stick of RAM in turn (if there are two) and/or removing the HDD or ODD allows it to boot. As it failed 'in flight' I would suspect either a motherboard failure, fan or heatsink failure. Basically if you get down to a bare motherboard bar one stick of RAM that can be swapped without fixing it you have a MB fault.

You have not mentioned any bleep sequence you hear so I have assumed none. If it does bleep we can get cleverer about what a particular code sequence indicates is wrong.