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Thanks for that, you're a star, but apparently it's been sorted by someone else, though I don't understand how.
He had a 2nd hard drive installed too which, because there's only 512mb memory, had fried (huh ?). Don't get that 'cos apparently the old hard drive was connected directly to the ribbon, with the C: drive connected direct to that. Anyway, that was removed and there was a SATA ribbon tucked in behind (!!??). So now, the IDE ribbon's been removed and the SATA ribbon used and while it's s-l-o-w, it's all usable. Oh, and I'd already checked the ROM drive was set as slave.
Now while I'm not a techie, I'm not a complete numpty, and I don't understand why both ribbons were there in the 1st place, let alone how a hard drive and a ROM drive are both IDE and SATA compatible (or even the motherboard !). So when I was asked in the original question if it was IDE or SATA, the answer's actually - both !
I don't get it but I'd really like to, for no reason other than - what's the set up on MY PC then ? I thought IDE, now I don't know ...