Good news is I dried out my iMac & it's up running again.
Bad news is I can't get it to boot from the internal drive, just spinning radian forever, the fsck log stops with this...
/dev/rdisk0s2: fsck_hfs run at Sun Jan 22 08:00:41 2017
** /dev/rdisk0s2 (NO WRITE)
** Root file system
Executing fsck_hfs (version diskdev_cmds-557.3.1~5).
Normally it would list all the drives after that.
Have run DW5, DG3, TTP8, Speedtools on it, all report good for files & permissions, even did a surface scan on it.
Seems I remember there was some hidden file on the drive to tell it to run or not run, can't remember the name of it.
Anybody think I could fool it by booting in SU mode, run fsk_hfs, then when it fails do a mac boot?
Of course I could just try it, but with my 14 KB/s internet it can take a couple of hours to load up my usual sites... here is no problem at that speed, but Apple...