Have an M4345, problems started with a 49 error. Replaced formatter, was fine for about 2 weeks, then screen went completely blank. No lights, no display. Only thing running was fan for DC controller, but could get an engine test with formatter removed. Replaced Formatter again. Nothing. Tried hard drive. Nothing. Put back original hard drive, replaced Power condition board and DC controller. Display came back but would not fully load program. Stopped loading at "D". If you left it on, eventually display would go blank. Replaced hard drive and finally worked. Tested and tested and worked great. So now I have replaced formatter (twice), hard drive, DC controller and power conditioning board. Machine sat over the weekend, and following Tuesday delivered back to customer. Plugged it in, nothing. Just DC contoller fan running. Pulled machine again, replaced engine control board. Display came back on, but very faint and with horizontal lines moving down the display. Still will not fully load program to operate machine, and now cannot get an engine test. Rechecked all connections to all boards, all good. Tried another power conditioning board, nothing. I'm thinking a bad DC controller or engine control board, but maybe I'm missing something. What a nightmare!!! Seems highly unlikely replacement DC controller or engine control are bad, but I'm out of ideas. Thanks for any help!!! Jeff M.
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