Hi to all the repair wizards out there... Got an interesting one, well to me anyway... Dell Inspiron 3552. TN 9GBYXN2. This is the most intermittent I have ever seen. Starts up from cold...Shuts down almost immediately. Leave it a few days...Same thing... Next time I try it will operate perfectly for hours... no issues...Even got a full Windows install out of it... I have tried with battery, without battery...Battery only , AC only...Multiple chargers...swapped RAM, Screen...managed to update the bios ( 4.4.0) via Windows even when it was in a "good state of mind"...the variations are crazy. Trying to isolate a voltage is impossible, at my level anyway... My thinking is a cold solder joint under some power related chip, hence the intermittent functioning... I have left the laptop in the same position operating with USB keyboard and mouse just so there are no external forces being applied. This was a last resort to try and troubleshoot. Only button used was the power button, So I guess 3.3v at that is fine as it works every time. 19v at screen cable is always on and under battery also get battery voltage. Any input will be valuable. Thanks guys.