Unless you can get your motherboard to sound out the sequence of beeps (and read up on what each beep means for your particular board) then there is no way to be sure if the processor is damaged. That is, unless you have another compatible motherboard available that you know works.
Nope :(. My computer is the best one in the house, and all other computers are 3-4 year old dells. None have LGA775 or PCIE slots at all.
I'd replace the motherboard. It may still be under warranty, if so request an RMA from the manufacturer. If not, I can help you pick out a new replacement board. Give ASUS a call, they should be able to help you troubleshoot before hand. At the very least they can help you figure out what state the motherboard is in.
I don't know how to check if it's still under warranty, but newegg has a thing where it says I have 1 year of being able to replace the parts(30 days to get refund). How can I go about and doing these things(rma/calling them for help)
Did anything happen before it stopped working? Perhaps a power surge? Brown-out? Do you use a UPS or surge protector with your computer? What is plugged into it?
The only thing I remember was that I overclocked it to 2.8ghz(normally 2.66), and about a day or two ago, it gave me some overclocking error while booting up, I forgot what it exactly said though :(. But I do remember I then changed it to original settings, and started it up. Then the next day(or day after, I forget) it wouldn't boot up. So could be bios problem.