a day or two later my computer shut down again. i tried the same as above, but it didn't work this time. i tried leaviong the switch off for longer periods of time, no luck.
then, today i did it again and it booted back up. it started sounding like the blades of a helicopter. i found the source of the noise to be the power supply. after a while the sound stopped and all i heard was the fan i put in about a year ago, which is normal.
what could be wrong with the power supply?