Computer power button blinking when press to start, and it keep doing for couple of hour then stop blinking, and press again to start the computer

Check for loose memory chips, and make just check to make sure all other bus cables are firmly connected.

Check the power supply. Of the computer. Be sure that the power supply is supplied in 220v-210v. Disconnect all power cord that power supply is connected. Then, plug it back in. try to remove the RAM. And clean it with an eraser on its bottom portion.. this is simple. But highly tested & proven. If it is not work! I recommended you to buy new unit!