2 days ago when I was cleaning my computer from inside from dust, and when i connected everything back (I didn't pull out any of the components) my monitor went blank, and only the brown light was shining. Then I disconnected the graphics card and put it back in. All the same, my graphics card still works, but I had to connect the monitor to the motherboard integrated card. When my system booted up (Windows 7 Ultimate), in devices and printers tab, under the computer icon was a yellow questionmark, saying that the PCI memory controller misses drivers, but it can't find them on the Internet. My MB is AMD 690v , and my graphics card is ATI HD 4670. What should I do? PLEASE HELP ASAP. Thanks.