Once I left my PC (Windows 7) switched on for almost 1 hour, it went to sleep mode. When I returned and woke up the computer, it got switched on and off several times, then finally an occurred that windows was unable to successfully retrieve computer from sleep mode, it will restart. As the computer was restarted my built in LAN was not showing up in the device manager nor in Network Adapters, and the green light is always on, like whether a port is connected or not, or even I switch on or off my PC, it is on until power is unplugged. BTW I am using HP DC 7700 Small Form Factor, and I think as msinfo32 tells that built in LAN is Intel(R) 82566DM Gigabit Network Connection. Please I am really in need.
