1. Apparently, blue PS2 discs are lighter than silver ones, so they tend to move around more when the PS2 is reading them. To fix this, you can put duct tape on the top of the disc. This will make it heavier, so it won't move around too much and it should make reading the disc easier for your poor PS2. People have told me that this indeed works (but not always). Don't go overboard with the tape though. Attempt at your own risk.
2. If the problems occurs when the PS2 is horizontal, try putting it into its vertical position. Or try putting it horizontal if it is vertical.
3. Use a can of compressed air to clean dust out of the system.
4. Make sure your game discs are not the problem. Keep them as clean as possible. Even small scratches can cause problems.
5. Open up your PS2 and clean it out or try adjusting the lens. Very risky and voids your warranty.
6. Try using a DVD lens cleaner (for problems reading silver discs) or a CD lens cleaner (for blue disc problems).
7. Send your system to Sony for repairs. Due to a lawsuit, Sony may have to repair your PS2 for free even if there is no warranty. Contact Sony
That is all the advice I can give. If the len(s) cleaners or compressed air don't work, then you are probably just out of luck. There is no magic way to suddenly get your PS2 working again without professional repair.
The trick to getting the discs to play on any PS@ (old or new) when they are black or blue is to put a piece of tape lengthwise and width wise around the hole in the disc on the topside (picture-side) of the disc. What this does is add weight to the disc and thus allows the PS2 to read it more accurately. I had bought many older titles not too long ago and was disappointed when they didn't work. Then I spoke with a Japanese expert online and he suggested using scotch tape around the hole in the disc and it worked instantly. Don't be fooled into buying a new PS2, just a roll of scotch tape. You'll only need four one inch strips.
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