If I then press and hold the button for more than 4 seconds (Pwr Off mode), I can then re-try power on but the same thngs happen.
There is a green LED on the motherboard which is lit the whole time.
I have tried removing the mains power and re-applying and this has no effect on the sequence.
After 24-30 hours with themains off, the computor stops sulking and will re-start. The power supply does not feel over hot and is well ventilated.
Any suggestions please before my wife throws it and me out the window.