Instructions
Plug one end of the PS3's power supply into a wall outlet and plug the other end into the back of the PS3. Push the main power switch in the back of the PS3 to send power to the PS3. This will not turn the PS3 on.
Turn on the Sony PlayStation 3. Wait for the PS3 to completely turn on. If the PS3's power light blinks green, then blinks yellow and continues to flash red, the PS3 motherboard is more than likely dead.
Hold the "Power" button on the front of the PS3 and the PS3 will enter its recovery menu. If the PS3 does not enter into the recovery menu, the PS3 motherboard is broken beyond repair. It will either need to be replaced, or Sony will give you a refurbished PS3.