In all likelyhood the problem you're experiencing is related to moving the motherboard from one machine to the next... If you changed the memory, I'd start there... is it in right, is it the right kind for the board, etc.
One possibility is that you replaced the CMOS battery incorrectly... backwards or not making a good connection. Some (not all) boards will not start up correctly without a battery.
Another possibility is that your CMOS (i.e. BIOS) settings got scrambled when you were messing with the battery. Why don't you just use the on-board "cmos clear" jumper? Almost all motherboards have one, check the manual for your board... You can get up and going in the time it takes you to move the jumper and replace it.
You can even do a CMOS clear from the keyboard on many computers... Turn off power at the back of the computer, hold down the END key on your keyboard while you turn it back on. This should take you into the setup screens with the system in a "safe mode" that will let you re-do your settings. (Note: on some machines it's the INSERT key, so you may have to try both)
---><font color=green>It ain't better if it don't work</font color=green><--- <P ID="edit"><FONT SIZE=-1><EM>Edited by teq on 05/05/03 02:33 AM.</EM></FONT></P>