No power, clean battery terminals, F1 fuse works
I just recently got in two game boy advance units (AGB-001) from Japan and off eBay. Both units will not power on and I've tested good, working batteries. I've also opened up both systems and checked the F1 fuse located right next to the NEG power terminal. The fuse appears to be working properly. I've used a multimeter on continuity mode to verify that it's giving the appropriate reading.
The PCB also appears to be spotless. I've looked over the board, there is no battery corrosion. There doesn't appear to be any bad traces or burnt out or damaged components. Initially, I thought I saw the 2nd device flicker green and red in the power LED but I haven't seen anything since I initially tried turning the game systems on.
The only thing I could think is that the power switch might be bad. I'm not entirely sure how to test the power switch to see if it's working properly.
Does anyone have any idea what might be stopping this unit from powering on?
Thanks for any advice you could give!