PB Easynote silver

Hi does anyone know of the fix for these units where they keep rebooting. this happens in dos in windows and while in the bios.

It can happen before post has finished or last upto 3 or 4 hours.

Please I am an electronics repair tech this is a hardware fault this happens with everything disconnected as well on external screen says missing os as you would expect with just a mobo and a bench psu connected for supply.

It is as if a reset has been issued.

Regards

Rich