Upgrading my Dell 2400 545
Take a look inside the system at the front panel connector - you will need to split out that ribbon cable and re-terminate the wires into 2- 3- and 4-wire connectors. The connectors aren't readily available - if you have a scrapped case, you can use those.
XP doesn't take well to being transplanted from one system to another. Do not try the move without a full backup of the drive - the most...
The mounting scheme and I-O shield are also nonstandard.
Given the labor involved in the above, replace the case - it won't add much to the cost, but if you do that, you can go with a full ATX board, and not be limited to micro ATX.
Other potential issue: if you try to reuse the Dell OEM Windows CD when you reinstall on the new board, you'll have to activate - which you will not be able to do automatically. You'll have to call Microsoft to explain your need to activate - and given their recent crackdown on OEM licensing, they may or may not allow it. If they don't, be prepared to purchase a retail copy of XP.
rbowes
alt.sys.dell talk from Newsgroups.