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1)PRESS NUM LOCK KEY IN YOUR KEYBOARD 2)IF A GREEN LIGHT IN KEYBOARD A GREEN LIGHT APPEARE IF CPU HAVE NO PROBLEM 2)REMOVE YOUR POWER CORD AND HOLD THE ON BUTTON FOR LIKE 30second TO A MINUTE AND THEN CONNECT IT BACK AND TURN IT ON
1. Just move a little or bend the cable at the connector ends and see whether the color changes to normal. If it happens then get the cable replaced. 2. Try to restore to factory defaults using the buttons on the monitor.
For all model notebooks. Reverse notebook upside down and search for litle optical drive icon. Around it you will see litle hole with a screw (1) on it. Remove the screw (1) and pull out optical drive (2), then insert it again back. This will autoclean contact pin on your optical drive.
If this not solve your solution try to clean pins with dry contact cleaning spray. Be aware with electronical parts.