Incidentally, I bought a PSU checker and have junked one PSU totally (it had 5 v and that was all) but I have a 90 watter (what use is that?) that is perfect, and a 350 that is merely missing the 5V off the P4 plug which none of my boards or drives use (what's it for) so that is a bit of a plus.

If I put memory in and attach a PSU, the board for the Piii733 will run (ie the fan on the CPU starts) if I use a bit of wire to emulate the on switch - but no beeps at all. Suspicious.

The board out of the Duron started without finding the switch connectors, and gave a long beep. I turned the PSU off. Now it won't do anything. I think the board is likely beyond redemption.

And I've found that the memory out of the Duron was 64M of PC100 and 2x256 of PC133 (not clever of me at some time in the past), so the latter two sticks will come in handy (if they work, I have no SIMMCHECK) when I try to get the Athlon 2000 up. I have two sticks of PC100 for that as well and the board instructions say it will take either DDR or PC100/133 (different slots and not at the same time).

But I need an OS!