10-16-2015 09:34 AM
I have had the same problem (black screen boot) , I even replaced the CMOS-Battery. No improvement.
These are the patterns I have been able to establish so far:
-The problem always occurs when I unplug AC plus Battery for a few seconds
-Reliable work-around is unpluging and directly repluging the AC within a second. Condition: Battery must be plugged in.
-If no AC is at hand, I have been able to recreate this work-around a two times by wiggleing the battery firmly.
-However, the problem still occurs frequently without any clear correlation yet.
Any ideas how to further approach this?