Need Some Serious Help

[rval73]

I tried to install a Messiah 2 pro v.1.30 into 2 differnt PS2's. First one was a version 3. Hooked up 3 wires, figured it was too hard, removed all 3 wires and now all I get is a black screen. Then I tried it on my v7 ps2. Installed the mod chip, all I get is a black screen. When I first turn on the ps2 all I get is a flicker on the screen and it justs stays black. Opened it up to check for wires that may have fallen off, none have. Checked continuity on all connections and everything seems fine. Don't know what to try next. Any help would be great.