My motherboard ASUS P5P43. E6600. sapphire HD5550. The once integrated network card was smashed by thunder. The CPU fan doesn't work either. Just added a network card.

Dear user, according to your description, your computer has been damaged before, and the situation is more complicated. It is recommended to remove the battery from the motherboard first and reassemble the computer after half an hour. Generally can be solved. If the problem still exists, it is recommended to go to a professional after-sales outlet for inspection and maintenance. I hope my answer is helpful to you. Thank you for your support of Intel products!