Older box has a nvidia FX5200 GForce card. Worked fine and as i was finished doing a clean reinstall of XP PRO after a reformatt of the drive ( giving that box to high school so wiped the hard drive from layman's eyes). All was fine and dandy UNTIL. Everything was up and running after i did the normal updates of the motherboard, etc. Then i went to nvidia and downloaded the latest vid card driver that worked fine on my newest box with a vid card that it uses. Nvidia always says backward compatable or someor whatever, with that in mind i downloaded the driver and got a pop up saying the driver was not for that card. I figured no problem i will just go in and delete the driver. BUT, before i could do that the screen started to look like a 16 year olds brain synapsis just before doing the "OD" thing. Then i could see i was not going to be able to get in the control panel to delete the driver, the screen blanked out. I rebooted and NOTHING, could not boot up, period. I hooked the screens up to another pc and they work fine. I took the vid card and tried it in another oc and it still works..... THEN i took the other vid card from the good box and out it in the box that went gonzo and fired it up. NOTHING I went in and tripped the cmos by taking the pins off of pins 1-2 and moved the pin to 2-3 and then put back to pins 1-2, still nothing. ( watching ES as i type this, no take out of the globex high yet, ) I am wondering if i tried to clear the coms with the power on. (i know better, but might have not been thinking). I know the cause was the wrong driver. This is a new one on me. Any ideas? I tried to just say screw it and went to do another reinstall of XP again BUT can not get booted up to try anything . LOST in a pile opf dung. PS, we nailed the globex high back there. we have a way of filling overnight gaps.