The solution was much easier than it seemed at start... the machine has a service mode menu (wich isnt listed on the SM i have, guess i'll have to check how many there are -.-"), thru wich i was able to do a mem clear and reset to factory defaults, and the problem was gone
These are the keys to acess that menu incase anyone else needs it.
[menu] - [*] - [#] these are the keys to acess that menu.