If you are not able to enter into BIOS setup (I assume that’s the reason for pressing F2), it doesn’t boot up without a hard drive and generic reset.
- Disconnect power
- Remove battery
- Hold down power button for 1 minute
Now check your problem is solved or not, if not then it is time for you to repair your laptop. You might need to go for the new motherboard, but the new motherboard is as expensive as a new laptop, so most of the time it is a bad idea.