Gameboy advance won't turn on

Hi All

I bought a GBA off of ebay, and it was working fine for about three months (except the volume dial), so I opened it, and put a small amount of isopropal alcohol on the knob area, and turned it a fair amount, let it dry and the game boy was functioning perfectly, like new.

Then one day I turned it on, and nothing, the power light comes on, and there is a slight crackle/pop when turning the dial.

Tried multiple cartridges from GBA, GBC, and GB, tried several batteries, but nothing.

As mentioned, you switch it on, the power light goes green, but that’s it, nothing on screen, no sound to even indicate if it’s an issue with the display.