Acer Aspire 5570Z won't start after upgrading to Lubuntu 14.xx

I recently upgraded my Lubuntu from 13.xx to 14.xx. The upgrade finished showing of some errors, which I don't recall, but the computer kept running. Then I tried to restart it, but it froze in a black screen with a bunch of stuff written (like a loading screen), then I switched it off and tried to restart again, but now it seem like the power button doesn't do anything.... no lights, no sounds, nothing at all.

This acer already had some starting problems previously to this. Sometimes it wouldn't start, but after a couple tries at the power button, and maybe removing the battery, it would turn on properly. But after the upgrade it seems like the power button doesn't exist anymore, it just does nothing.

I already tried removing the batteries, unplugging the cable, plugging the cable back on and holding the power button for a bunch of seconds, but nothing helped.

I also removed the ram sticks, sort of cleaned them and put them back on, still nothing.

Also my battery was just plain dead, it doesn't recharge anymore. When the computer was running and I removed the power cable then it would shut down immediately. I know it probably shouldn't, but maybe this has something to do with it.

I'm out of ideas, anyone could please light my way and help me get this fixed? I know this seems like a hardware failure, but why after an OS upgrade? What does it have to do with it? This is puzzling me.