Windows 7: NEed help with my 9800 gtx

So one day i was playing minecraft and my computer went on and off on and off on its own.... then when it finaly came back one ,everything was HUGE. so i tried to make it small but i couldn't i downloaded new gfx card drivers uninstalled my old drivers restarted installed my new drivers restarted and when it came back on it showed an right mark with 9800 gtx to it in the left corner.. so i tried to open a game but it still didn't want to open.. so i went to device manager and under Display adapters there was LogMeIN mIrror driver( Dunno wat this is ) and 9800 gtx /9800gtx + and that had an exclamation mark next to it - since everything has happend my pc is abit laggy could be my motherboard but let see, any help would be appreciated

You or someone installed logmein so you or they can remote into your PC that where the logmein driver came from.

You did try and change your resolution back to a higher setting right? You didnt say so, so I have to ask.

Id visit Nvidia and download the latest driver for your vid card and reinstall it! Drivers - Download NVIDIA Drivers

The yellow exclamation mark is telling you there is something not right with the current HW/driver setup. A reinstall of driver should fix it!

Sorry , i did try and put the resolution higher.. but i coudnt was the same!. i have the latest drivers from nvidia but still nothing!!!! i forgot to add.that wen i restart my pc these green lines show but only for an while..

So noone can help me

Check your BIOS to see if any settings regarding your video changed, check all cables make sure everything is a good connection, perhaps even reseat the video card...

If all else fails, try a system repair from Windows 7 boot dvd.