Sorry Guy's no luck, I have tried all the idea's above apart from the Debug file, and I'll try that next.
I have reseated/cleaned and tried to boot with the 256 and the 512 mb memory sticks in the first slot. No change. I am 'helpfully' told that I may have fried the RAM. There is no visible damage evident, but I did notice a light brown residue/thin dust in the vicinity of the centre contacts when I extracted the 256 stick. Having said all that the memory was only moved a few months ago by the engineer who fitted the present motherboard. Also apart from the now very minor problem of the corrupting clock the computer was in great shape and was never running better prior to flashing the BIOS.
I have also cleaned and reseated the graphics card (MS-8838 Ver IIb), no change.
I notice however that whenever I boot with a floppy installed, then the 'beeps' don't come. I should also point out that my initial description was misleading. On relfection they sound more like a short followed by a longer, lower tone. Rather like a mocking 'ee-aaw' sound. Familiar to television viewers as a wrong answer in a game show! The floppy rotates for a few seconds, and will also do so if any of F8/F9/ctrl keys are pressed, but still the 'BSOD'.!!
I had thought of going out and buying a new board, but if the RAM or graphics cards are also gone then I suppose keeping my guarantee intact and waiting a week or so for the new board is best.
I'll keep playing meantime, after all I suppose I can't make it that much worse.........can I?
