The machine is doing everything as it should...no shut downs, non lock ups ,no slow ups, no fail to save, no booting out of programmes.......running as sweet as it could be.
I would guess if there was a real problem then the odd little behaviour quirk would have shown.
But no......touch wood :doho: it all seems OK
I went into a high rate of concern and saved what I was doing as it was not at start up the noise occured.....about ten minuets later. But as mentioned above it was all settled in less time than it took to make the back up disk.
The total time was about for minutes but enough to make me think

But all seem well and the cleaning was a good move in any event.
Garry