MV-1FZ issues

Hi. My MVS suddenly stoped booting the game cartridges.

It boots up the BIOS, but after the Universal BIOS screen, the screen goes black and the game does not boot up.

The 5v and 12 V are ok. And i've tested with multiple game carts and no go.
I've even cleared the Backup ram contents.

Any thoughts ?

What version of Unibios and did you clean the cart slot? Check the cart slot for any broken pins. Also if you boot without a game inserted what color screen do you get?

Color screens are on an AES... The MVS should give you a crosshatch screen if there isn't a cartridge inserted.

Do you still have the regular BIOS chip?

if the mvs is turned on without a cart is go to the crosshatch screen.

The issue remains with the original and Unibios. Ive checked (visually) the board and i dont see any damage.