Acer Aspire 8930G sudden random power loss and shutdown[solved]

I had been plagued with my computer switching itself OFF suddenly and randomly for about the last 8months.
IT would usually occur if I clicked on a new task ...sudden and immediate loss of power would result and the sound of the hard drive winding to a stop would be heard. It would also occur on start up but less frequent.

After each occurrence the computer would re-start without any apparent damage nothing lost in Outlook, Chrome would complain it was not shut down correctly and did I want to restore the previous session.
All these symptoms were happening while the computer was used without battery powered only from the mains.
I started to use the computer with the old 5year old battery in my quest for a solution. I was scouring Google for solutions to no avail. A Host of other remedies were tried Upgrade from Vista to window7, then 8.1pro; update the Bios, increase the Ram to 6Gig( much earlier I went to a 500Gig SSD) ;swapped out ram cards, swapped back to HHD bought a new battery, new charger etc, etc.
I noticed while shopping for those items there were lots of replacement Acer 8930G charging sockets and cables for sale I invested in one of those.
When I opened up the round cylinder covering the charging socket and unscrewing the mounting screws holding it in place I discovered the Negative lead from the socket going to the motherboard was DETACHED at the back of the socket. Fixing that connection has resulted in problem free use of this computer for over 3 week.

Just an aside the $6 power cable ordered on EBay for my model computer did not match the motherboard connector. I had to re-solder the broken lead back onto the original socket. no big deal. For anyone like me with limited expertise, I'll venture to say, I had to take the cover over the power button and the Keyboard out as well to disconnect the power cable away from the motherboard. Both have ribbon connectors that need to be disconnected. I suggest a You Tube Google for insights into the dismantling for your own peace of mind. The cable and socket come out, easy enough and can be soldered out of the machine. You could try just taking the socket cover off and soldering in situ; seem fiddly to me so I did not risk it. Alternatively, get the right replacement for around $6; just make sure to match the motherboard end as well. Good luck.