Hi all, I have a mini 1.66 model and I have a few questions. First I bought the unit used and it worked fine. Then I decided to upgrade the HDD, ram and processor to the duo 2 1.83 Ok I finally replaced all the parts at once and now the unit will boot up but the display is blank. I did put all the orginal part back and I get the same results no display. The only thing I did not do is put the cover back on as I thought it would not make a difference. Has anybody have any ideas on what could be the cause?