Mvs 1 slot, Cross Hatch Test problem

Hi guys i've just got myself a job lot of pcb's and a 1 slot neo mother board, When i pluged the board in i got ram test o.k, Then i saw that all the dip switchs were down, I push them up and then turned on again but the Cross Hatch Test screen came up and does not go away even if you play about with the dip switchs.
Can anyone give me any advice on this, I know i've asked a lot in my previos thread but would make my day .

Model MVH1A

Also the pcb's i have are non jamma and need a edge connector there are the edge connectors on the board one has 22 and the other has 10.

Thanks you super bunch of guys

I've been looking on the site about these problems and i have done all the stuff you other guys have done checked cleaned remove top from bottom board, Cross hatch when top and bottom board removed and with 5 games tried i can also go through the rest of the test menu, Dam dam dam .

Make sure the cart connectors and board cart socket are squeeky clean, dirty connectors will give you a xhatch, just like booting up with no cart inserted.

http://www.hardmvs.com/html/cleaning.htm
http://www.hardmvs.com/html/slotCleaning.htm

I've just give the board a good clean just like you said but still cross hatch, I then borrowd my friends 1 slot to see if it was the top board so swaped them over but still cross hatch screen, I've tried all 16 of my games out and still the same.

maybe broken traces near to where the cart carrier plugs into the mobo