my odd 32x/scd/genesis

sometimes when i boot up my 32x/scd/genesis the screen goes completly blue hue or sometimes i will have a cart in it and it goes to the scd bios screen.

what should i do.?
check the connection with the systems, give them a thorough cleaning, also as arakon said before take the 32x apart and clean the ribbon cables (white ones) becasue they all tend to get dirty really fast and cause problems.