Hi Osprey,
The error 4E and sometimes 49 only occurred occasionally.
After diagnostics testing, I shutdown the computer and when I went to start it 2 hours later, the first press of the power button did nothing, the second press similarly, but on the third press it booted normally. (I made sure that each press on the power button was firm and not too short.
Do you think that updating the BIOS will help?
John