One day the computer failed to display the login screen. All that worked were esc, enter, and up and down arrows. It had a black screen. I almost attempted a restore. I went into it but did not give the command to execute restore so nothing changed. Turned off the computer. Two hours later it went back to working. Now the video will not play on You tube. Audio is fine. When youtube stops, the still photos are visible. The you tube screen is green while the audio plays. Sometimes the green has scratch marks of many colors. Also will not delete history and cookies. Any ideas? Help
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