I posted this thread originally in the motherboard section but it clearly doesn't have a specific thread topic as its unclear (except the power supply) as to what is wrong.
Read this thread and respond there:
http://www.tomshardware.com/forum/261871-30-have-device-manager-list-disapear
Read this thread and respond there:
http://www.tomshardware.com/forum/261871-30-have-device-manager-list-disapear