Thanks for input. Yes the board was totally disconnected whilst battery was removed.
I have already looked at bios recovery. This requires an active CD/DVD, floppy or USB. There is no life there, there must be an active device to load bios recovery.
I removed the jumper for recovery mode, it makes no difference. A disaster board, I am used to Gigabyte boards that recover from bios errors with no problem, they also have a removable bios chip if it gets really bad. Neither is available on this board.
Not very good Intel.
I should add that two identical boards failed in the same way. No bios after a memory speed change. The first was destroyed when run over by a vehicle on the way to repair. Hence a second board was applied, it functioned correctly with Windows XP until the same apparently irrecoverable adjustment was made. The detail being above.
Message was edited by: davmax