Hi,I have a canon 5255 ,it starts to boot ,then all the screen goes blue with a red border around .no error codes ,no error history,lost all ip info.ocasionally it comes to ready,but sometimes the copy option is missing,unable to log in,and head key does not work .replaced main con 1,reloaded sys software ,still no good.tomorrow will try main con 2 ,and hard drive,also when doing sys check with 2 and 4,results for 8 and 18 no good,