Out of the frying pan, into the fire!
Problem solved.I tried turning off the modem, reseting the modem, didn't work,
the next day I realised there's that other little box down there, the router?
which has been on 24 hours a day for the last year!
So I reset that and turned it off for an hour.Turned it back on and everythings back to normal.
Sweet
The next day I plugged the power outlet board the computers on back into another power board,
since I'v been unplugging it at night, don't ask me why.
Zap! it crackled as it slid in and Flash! from the back of the computer!
I unhooked it again and now I'm waiting for the working week to start again so I can get an expert to double check it.
I can't find any damage anywhere and both power boards still work,
I took the sides off the computer, no damage either, but it's full of cobwebs (incidentally discovered the on/off switch DOH!)
I'm writing this on Mums laptop.
At the very least the computer needs a professional clean and service
and the ppl I found also do training, which I've determined to do, damn the cost.
I'm sick of being a computer illiterate and living in fear of the computer and the confusion and making embarassing mistakes
and being in awe of Genius' like Alex
So, serendipity, maybe.
The only worry is if I've lost all my photos of my nephew and nieces growing up,
which I always meant to share or save, but didn't because of the previously mentioned fear and confusion
and procrastination.
Alex, while I've got your attention, would you add a 'direct debit' option in the Support Wrong Planet Awareness! page?
I've been meaning to make a donation forever
But it would be more reassuring for me to know that every month an amount was sent to you without fail,
rather than relying on my best intentions thwarting my procrastination, anxiety and executive functioning problems.
Thanks everyaspy that posted, it all helped.
even the stuff I didn't understand. 
_________________
Be kinder than necessary for everyone is fighting some kind of battle
-Jaleb