If it is an ATX power supply in the dying Monster swap it out with your newer Monster and see if your Monster works properly.
Of Course I am Scottish and my Wife is Irish and both of us were into some Guinness last night and I could have lost track of what Monster got plugged into what ?
As.....We don't drink much at all and simply had a few lying around from a guest that left them at Xmas. Oh and it was Saturday Night lol.
But you need to tinker with it failing that replace the P.C.
Barton 3200+ 400MHz
A7N8X Deluxe
Liquid 12 Celsius
2x512 Crucial DDR 400 PC3200
GeForce FX5900
Two Maxtor 40Gig 8MB cach 7200rpm
SONY RW 52x/24x/52x
SONY DVD 16x/40x