I think you are plug/jumper problems. I don't believe a boot disk is neccessary. I don't use Win XP though (Win 2k sp4 and 98se for me)
First I recomend you go to Maxtors site and d/l the free proggie called Maxblast. It's very handy for formatting and parttioning HDs.
First check the jumper ("plug" as you refer to it) of the original drive. Make sure it is set to "master" (assuming that's what you want), if not set it to "slave".
Be careful if the old drive is a WD, If it was on the IDE channel by itself (no slaves etc) it may not have the jumper on it. When they are alone on an IDE channel, no jumper means "master". So if you add another drive, you must set the jumper to "master with another drive sharing the IDE channel".
The Maxtor offers master, slave,or cable select as far as the jumper settings go. I suggest forgetting about cable select. Rather set it to master or slave. Whichever you want.
Don't mix cable select and master/slave when you have multiple drives.
It may be a good idea to keep the HD labled as master on the connector at the very end of the IDE cable. The slave s/b on the middle (of the IDE cable) connector.
Note that Maxblast is a bootable proggie. In other words, put the floppy you create in, and boot (or reboot) and the proggie will come up automatically. You CAN'T put the disk in the drive once windows is up and click on it to open it. You MUST boot to it.
Oh, aside from possibility having the jumpers out of place, you may not have been able to boot if the IDE connector was inserted incorrectly. Double check that carefully.
When your mobo won't boot and gives you "beep codes", listen to those as they are trying to tell you the problem. Often the beep codes are in your mobo manual. Other times you have to use google to look them up.
Hope that helps.
Mobile XP 2600+ (11X200)
Abit NF7-S v 2.0
Maxtor 60GB ATA 133 7200RPM
512MB Corsair Twinx 3200LL
BBA 9800 Pro
Enermax Noisetaker 420 watts
Win2K sp4