Last night my PC turned off due to a lightning strike. This morning when I turned it on, the graphics card wasn't being detected by the monitor but it's fan was spinning. So I used the onboard graphics which were working fine. After logging in, I noticed that the onboard LAN wasn't working. I tried rebooting but it didn't fix it. Also, the computer restarts itself immediately after shutting down. Is it the graphics card or is my motherboard fried? My motherboard is a Gigabyte GA 78LMT S2P and the GPU is an AMD HD 6850. Any help would be greatly appreciated.