Instructables
video Atari 2600 power switch LED
I have always liked the Atari and it is now a true classic. But it never had a power on light. There are mods out there in Google land but all require you to drill into the case. I feel that drilling into the case of this classic would be a crime. So I set out to see if you could mount an LED into the power switch.
Please note that the LED I used was rated at 5v. If you use one rated at 3.5v you must put a 150ohm resister inline when you connect it up to the positive track, also if you find the LED to bright a resister will dim it.