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I'm not really answering your questions here but the oddest things happen with computers.
On a 3 hour business trip I decided to wipe a hard drive disk with a laptop using the battery (well those programs usually assume you have it plugged in). Driving makes you forget about things and the computer browned out (juice in battery but not enough to power). When trying to go over some business and by plugging in my computer it would just not start. Nothing could be done. I called IBM to troubleshoot (thinkpad Lenova) and they would through checks and eventually said new motherboard. After tinkering with it some more and disconnecting and reconnecting some pins the thing started right back up.
Every time there was a problem the thing would have to be unplugged, battery removed and then unconnect all the pins and then reconnect and then it'd start right up. Very hard to diagnose but some with capacitive build up of some kind.
Don't buy IBM lenovas, at least nothing pre-2007.
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