I am currently working with a 4 year old P4 2.8ghz rig. Was not really wanting to upgrade a system this crappy however in the past month the fan on the Geforce4 ti 4200 card started making a noise similar to a dying Giraffe. The rig only has a weak 185W psu which limits upgrades. Also the board only has a 4x agp slot.
Any suggestions on a suitable replacement card? all I want to do is beable to play WoW. Would have liked to play Warhammer online, but I figure that is out of my reach without replacing the PSU.
I have an old 24/7 computer with a 2.2 gig athlon that lost it's Radeon 9800 due to a fan failure. I bought a low end geforce 7600 card with passive cooling that I would think is alot faster than your 4200. Not sure about the power draw of this card, and it was overpriced being it's a dead interface and all, but it works great for what I need. And there is always Craig's List.
Maybe look for something similar or a bit slower to cut more power. Shouldn't be too hard to find something faster than the 4200 and if you can up size the psu, you can get a pretty decent card.
Or try lubing or replacing the fan on your old card.
id unno about the pasively cooled 7600, but I still have several old 7600GT's ( 512MB version ) running that need a minimum of 450 watt PS....and trust me, they mean it, I've tried running them all ( different brands ) on less and failed. I'm usually a big fan of maintaining old equipment, but the 185w PS really makes things difficult. If you feel like gambling, try E-Bay for a PS and 7600. They were the best AGP cards I had and ran quite fine in a 4x slot. Just do the math though, you can just as easily find a good deal on a slightly better system with everything you need.