The flashing screen (or blinking light) problem is very common with the NES. The system turning off and on is caused by the lockout chip is not recognizing the cartridge and prompting a reset once every second. This problem is usually caused by either a bad 72 pin connector or your game contacts being oxidized with a greasy film or dirty.
The solution is to first clean your game contacts to see if that fixes the problem. I would recommend getting a game bit key and taking the game apart for cleaning, but if that is not an option, use a q-tip with electrical carbon cleaner (such as Deoxit) to clean the metal contacts. If your games are clean and you still have the blinking, it's probably time for a new 72 pin connector.
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