Asus M2N-E does not boot after coming back from ASUS repair

Same error as before i sent it to ASUS for repair. ASUS told me that the board has no errors (NTF). I already bought another board while the M2N-E was at ASUS facilities (M2N-SLI Deluxe). Now i have an error with M2N-SLI and switched the boards to do further testing. Thats when i encountered that ASUS did not reset / repair the M2N-E, which has been functional before it got errornous.