Laptop Crash

Well I’ve had my laptop for about 3 and 1/3 years, Today I was using my laptop when the fans suddenly started going at full speed and about a minute later the laptop abruptly shut down. I tried to restart it by pushing the power button but all that happened was the power light flickered and the hard drive light flickered as well. I also heard the hard drive click. This happens every time I try and start up the computer. Things that I have done include: take out battery, unplug power cord, and I also opened it up to make sure everything was connected and nothing looked bad (I’ve taken apart and fixed many computers so I know what I’m doing, but not laptops). Still doesn’t work. Any suggestions would be appreciated, right now I think it’s the motherboard, but I could be wrong. Thanks in advance!