hello willy, stuck in standby is common but they never come out on their own, i have placed several postings on here in the past about these, it has nearly always been the flash data corrupt, but as you say you can get it to come on i dont think this is your problem. are any of the caps swollen on the psu, we had that a few times, there were two types of psu fitted on these, can you post a piccie of yours please and well go on from there, we have both types in stock but unfortunately out of stock of the main pcb