For some reason, my computer has decided not to recognise its two CD-ROM drives when it started up.
When this started happening, I thought I'd try detaching the cable from the motherboard and plugging it in again; that worked, kind of. At the next boot, the system recognised both drives again. But afterwards, they were gone.
This morning, for some reason, it decided to recognise them again. Bizarre.
I wonder whether the computer is simply getting old (perhaps some capacitors going wonky?). It also decides to freeze occasionally. Perhaps that's its way of saying "I'm just a piece of consumer equipment and am not designed to last more than two years; please spend lots of money on a replacement". *sigh*