Mvs cab confusion.....

Ok......Well heres the deal. I just bought my very first original mvs 4 slot cab yesterday....I brought it home cleaned it up plug it in everything worked perfectly.....I played the fuck out of it almost all night.....About 5 hours straight. Everything worked perfectly....I shut her down for night...... I turned the cab on earlier today.....It started up just fine all the games were working perfectley......I left it on and went to the store for like half an hour...I came back home and the monitor was set on the test mode....I tried to exit the screen and nothing happend.....So I shut the cab down and started it up again.... It went right back to the test mode....So I checked the whole system through it... All the buttons,joysticks,memory card,test button,service button all registered on the screen I've tried doing as much as I could to make it work....Unpluging the power supply, unpluging all the harnesses that plung onto the mvs board and even checking all the rest of the plugs through out the whole cab to make sure they were all in tacked and hooked up properly nothing seemed to be damaged or burnt out....I also checked out the dip switch on the board....Everything their was also set properley.....If anyone out their can hook me up with the solution please do so Neo G-Tron

The test toggle switch may have shorted across the poles. Disconnect the wires at the back of switch to see if it clears.