"Noozer" <dont.spam@me.here> wrote in message
news:VUZAi.101085$rX4.33391@pd7urf2no...
>>> (Inconsistent symptoms, but machine always locks up within 4 minutes of
>>> cold
>>> power up, regardless of which operating system is being booted.
>>> In fact, on one occasion it locked up in the middle of entering the
>>> BIOS
>>> password. Commencement of problem coincided with starting to use
>>> broadband
>>> (connected to router by ethernet cable). Tried replacing use of Realtek
>>> ethernet
>>> controller with Intel Gigabit PCI ethernet card. No problem if keep PC
>>> switched on permanently)
>
> I would suspect a faulty PSU, or failing capacitors on your mainboard.
>

Have you and "Grinder" been replaced by "kony" clones?

Not an overheating problem.

LoL;
Ken