I am having a problem with the CMD PCI-0640 PCI to IDE Controller on an AMI Atlas 721 motherboard. It had seemed to all be working properly untill I installed a 6.4Gb IBM IDE UltraAt Hard Drive. That installation all seemed to go OK but after about 2 weeks the computer started to hang up. It would have to be rebooted and the Hard Drive had to be redetected. The computer was then OK for a while. I have tested the Drive in another computer and it is OK. When I have start4ed to look into this further I find that the 2nd and 3rd partitions are not visible on the drive and that the Hard Drive Controller has an exclamation in the Device Manager. Advice and help will be appreciated.