My mother bought a Lenovo 500 gb SATA 2 Desktop H series computer 9/12/10 and 2 days ago the screen(Ativa) started saying "No Signal" then goes to black. I've checked all the cord, pins and the power strip. I Plugged my laptop to the monitor and her screen worked fine. Opened the hard drive and checked the seating of the ram and still nothing. I didn't see a video/graphics card inside and was told it's probably internal. The computer does come on and the fan is working. Please note: I have Zero computer knowledge and had to watch a YouTube video to get this far! Other info: Windows 7 Home Premium, Card reader: 16 in 1, Processor: AMD AthlonII x2215. Any ideas or help would be appreciated!