AV Mod Top Loader Blue Screening

So about 1 year ago I modded a Top Loading nes for AV out using the NES2 Mod guide from DMTGamePack at NESDev. It worked perfectly. About 1 month later I fired it up and noted that I had to tap the machine to get the picture to come on. Now after moving house I plugged it in and all I get is a bluse screen. I get this bluse screen regardless of which game I insert and it appears even without a game. Visually, the wires look fine and none of the wires have come loose. Anyone know what this is and how to fix it?

 

How do you have the mod set up and are you sure your games are clean?

 

Okay. I cleaned the contacts in the unit and the cartridge and it seems to be working now. I was sure it would be something more disastrous because my RetroN3 was handling the same games just fine.