Ok to be honest theres a very low chance of it being due to a quick overheat....
May I ask when this problem occured, what were you doing at the time?
Have you recently installed any new hardware into the computer? e.g new ram or an extra hard-drive..
Does the computer start up in safe mode (tap f8 when you turn on your computer just after the bios screen disappears "the big picture of your computers brand") then select safe mode, give it about 5 minutes to see if it boots..
Please reply with answers and I will get back to you
