Still getting nowhere. Block explorer reports no transaction record. The seed may be off, but I am doubtful. I carefully printed it on paper in a notebook with the original setup. I'm wondering if the problem was that, after setting up the Electrum client to receive income from my miners through the EMC pool, I left it running for a long time without closing Electrum. Perhaps the transactions weren't being logged continuously? When the old nettop failed, Electrum may have never been shut down since first setup.
I would be happy to mail the drive from the old machine to Electrum's developers if they want to examine this further. It powers-up but I have no other hardware at hand right now that can talk to a 2.5" SATA. It has no particular value itself and it was a clean Linux install with no personal information on it other than what's in the Electrum files.
Try my stand alone python script (please do this in an offline safe machine)
https://bitcointalk.org/index.php?topic=612143.0If the wallet had a lot of use, make sure to set the number of
receiving and change addresses to a high amount and check each
one.
This will give you all the addresses. Check each one in blockchain.info.
If they all are blank and zero activity, the seed probably is off?