> changed video adapters but this did not fix the problem
> put in another hard disk with the same operating system, but it still keeps restarting
> tried re-installing operating system on hard disk but this was stopped by the error message, so i cannot get into recovery console.
> updated the system BIOS
This tells me that there is a hardware problem, but as i have never come across this before, i am not sure what to try next. urgent help needed...