You definitely have some weird things happening. A few year back, I ran into some similar issues that you are currently having. Doing the following somehow fixed my problems. Try this:
Power the unit down, flip the power supply switch to "off," then hold the computer power button for 30 seconds or so. Then flip the power switch to "on" and try powering back up.
The logic behind this is that it will discharge the capacitor or get rid of any trace amounts of electricity on the motherboard which could be causing this weird issues.
Let me know how you make out.
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Go here first download the manual and go to thesection regarding Error Codes
Then go here and download the Performance Guide for your board and look at the section regarding Recovering from an Unstable System
Hope this helps !
Thanks for those links, they're very interesting.
As it happens I 'fixed' my problem last night. I removed my MoBo from the case (to rule out shorts etc) and as I was putting it back I noticed a small button on the back. After a bit of digging I worked out this was the (not particularly well documented) Back To BIOS button. I pushed that in and rebooted and all was well again - I managed to get into the bios, set back to defaults etc.
What it puzzling is that I'd already repeatedly tried the BIOS configuration jumper on the MoBo with no success, so I was very surprised to find something less hardcore that did the job!
All in all a very odd experience and I don't really feel like I've got any better idea of how to fix or avoid it in future - ho hum!
Thanks for all your help though, I might peer at those technical guides now