>> The problem was the driver and SP3 (W2k). I went to
>> xerox.com and downloaded the driver for XP and after one
>> error while installing the driver, the machine works perfectly.
THANK YOU THANK YOU!! I have had trouble over and over with my M950. Last week I installed all the W2K service packs and the printer stopped completely. I reinstalled the driver and same problem (fuzzy stuff on top left of page, also sometimes it just sent the print head back and forth forever). After loading the XP driver it works again, woohoo! I thought it had become a boat anchor.
In return, here is a tip I can pass along: my print head dried out and no blue would print, even after a new ink cartridge and doing "Maintenance/ Clean Print Head" many times. I looked for new print heads and found a source somewhere for $245 (US) and that was too much. In desperation I removed the print head and held it under the faucet (very warm water) for about 30 or 40 minutes, shaking it every few minutes. Finally after only clear water came from the head, I let it dry on a towel for a long time then put it back in the printer. After running a "clean" cycle, it worked like new. Note that using alcohol did nothing, just use plain warm water.