It works fine but when I turn on the power switch at the rear of the machine the PC goes to boot up (for about 2 seconds) even though I have not pressed the ON button at the front of the machine. The PC then goes back to being 'off'. Pressing the ON button then boots it up fine.
I am afraid this will damage the HDD...
Does anyone know what might be wrong? The power unit is new and was working fine before the upgrade.