Keyboard and monitor interchange

Hi. Recently I put on my pc and the monitor came on with a couple of orange and white lines. On the advice of a friend I cleaned out the pc, removed dust with a vacuum cleaner, changed the cmos battery and cleaned the graphic card. Now when I start the pc either the keyboard won't work but monitor does or vice versa. Please help, I have a lot of data on the pc that I don't want to lose. Any tips?
 
Make backups on removable media or cloud- even if you have to go to Safe Mode.
Try another keyboard. Try another monitor.
 
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