Keeps restarting meaning it does not boot but shows a logo and restarts repetitivly?
1) Reset CMOS:
Steps to clear CMOS using the battery method
- Turn off all peripheral devices connected to the computer.
- Disconnect the power cord from the AC power source.
- Remove the computer cover.
- Find the battery on the board. The battery may be in a horizontal or vertical battery holder, or connected to an onboard header with a wire.
- Remove the battery:
- If the battery is in a holder, note the orientation of the + and – on the battery. Gently pry the battery free from its connector.
- If the battery is connected to an onboard header with a wire, disconnect the wire from the onboard header.
- Wait 1–5 minutes, then reconnect the battery.
- Put the computer cover back on.
- Plug the computer and all devices back in.
2) If reset didn't help, find a shop which can actually reflash BIOS with a programmer.
The BIOS is usually stored on an EEPROM chip -- an Electrically Erasable Programmable Read-Only Memory. Under ideal conditions you can flash it with a little bit of software. If things go spectacularly bad (i.e. the system is bricked), you'd have to pop the chip out of the motherboard, pop it into a programmer, rewrite the chip with it, then pop it back into the system.