Bit of a long shot, but my original model Game Boy is acting up. Was totally fine before I stored it away, never had a problem with it, but now after taking it out it displays jailbars through the sprite layer on any cart I give it.
Wouldn't be such a big deal but I had this one back light modded ages ago, and it's in perfect cosmetic shape.
Don't know about cleaning the contacts, they're tough to reach, but then I'm not sure if this is the problem. The old slot dust blow doesn't seem to improve anything.
