ok. get another pc, and burn a disk of some kind of linux build, Ubuntu would be my choice, its free and alot like windows yet its not. burn the ISO file to a cd, put it into the broken pc, and install it. now you have a backup OS. from their do what is needed to figure out the problem. this is only a temporary solution.
IF ubuntu, linux mint, debian, or anything else does not boot, then its probably hardware, i had a problem like that, better have a pro take a look at it at a shop or something.