Some times your PC may be very slow & when you turn on next time it will not boot, but powers on. you may think that its a very big problem. But according to me its very simple to solve(after reading, For you also).
The reason for this problem is dust in RAM. So that follow the steps shown below
- Remove your CPU plug from power
- Open the CPU using necessary tools & remove the RAM
- then clean it carefully using cotton & also clean the dust in RAM slot
- Then re-insert RAM to its slot.. That's all.. Now you can boot your PC....
Please don't try this process,when power supply is connected to CPU.. Some other problems in other hardware may also cause this problem,but i can assure 95% solution is the above mentioned