sega multi mega repair

[raylyd]

could someone tell me how to repair a sega multi mega

with cartridge recognition issues and the sega bios screen dont work

i sent it to someone they have reflashed the bios and still will not work

i just get a black screen

 

[Kuta]

Does the machine power up?

 

[raylyd]

yes it does power up and no sega boot screen