Chosen Solution
I put batteries in it but it won’t start up
If that does not work try putting some 90% isopropyl alcohol in the power switch. This works like a charm on our refurb units.
Emery Sweeten, Clean the battery contacts inside your game boy with a pen eraser(has a little grit) to remove corrosion or use a Qtip dampened with 90%+ Isopropyl Alcohol to clean contacts. Install another new set of good quality batteries and give it a try. If this does not do it it, there is likely an internal fault, bad switch, loose wire, etc..The link below will show how to disassemble you device if needed to check/reseat connectors and check for damage/loose components. Good luck. I hope this helped you out, if so let me know by pressing the helpful button. Game Boy Color Teardown
