Remove case cover.
2. Heat sink clogged.
Step 1 and clean the heatsinks.
3. CPU fan failure.
Step 1, then power up and check the fans.
4. If 1, 2, 3 don't help, fit a power supply with at least 100 more Watt capability.
I have an HP a335w with a 250w PS. After only 5 mins of running, everything shuts down. I did notice the fan on the PS is still running. The light on the back of PS is also still on. The only way to get it to restart is to unplug the power from the PS. After light goes out, I can plug back in and startup. But shutdowns again after a short 5 min period.
This is a new install of Winxp and hasn't been connected to the net. So viruses, etc., have been ruled out.
Is the power Supply going?
Thanks in advance.