|Sounds like the BIOS may be corrupt... a temporary solution would be to pause the BIOS post fot 5-10 minutes before proceeding with the boot. That's if you can see the BIOS post.. if nothing shows in the screen you may have to repeat until you get to see the BIOS post on the screen. |
You could also reset the BIOS removing the battery for 5-10 minutes. Following step would be to replace the button cell BIOS battery,
Last step would be to flash the BIOS with the latesta available update.
I also sounds like the processor may be overheating. This due to poor ventilation (if the coller fan works, it may not be running at normal speed)... Or poor contact between the processor and heatsink.. nothing some thermal grease can't solve.
If overheating a computer may either; restart, turn off, or not boot... depends on how either the system or BIOS are configured to handle this situation. If it's possible to access the BIOS with F2 key and check this setting.
Read the Troubleshooting Tecniques, Power and Battery Problems, something there may help