I seriously doubt HiJacl plays any role in this - too many has used it for to long for something like this to popup...

Most issues of garbled displays / dimmer problems have been either a broken fuse or resolved by adding a small capacitor to the circuitry.

Your best bet is contacting support (david@empeg.com IIRC), but they're closed over the holidays. If your player was one that came originally from the big firesale you might want to toss in a mail right now anyway - just be ready to wait for a response until January.

/Michael