Laptop incident: problem solved.

A little sharing.
My laptop had been out of order for over a year.

All USB ports stopped functioning.
The touch pad double-tap lock on/off did not work any more.
String noise ocassionally.

I asked various shops, 

searched internet, 

brought it to waited and asked people. 

I tried several tips found on internet but still couldn't.

Although the last person I took my laptop for him to check

 did not find cause or solution, 

the interaction prompted me to notice one thing.

So

 I tried to turned off blue tooth.

It solved the problems.

Except one USB port was physically out of order.

 Other two are responsive.  :)
Touch pad function normal again.
And it is quiet so far (two days now).

Eventually.

p.s.  some issues & further investigations,
  please see
http://sn-uk.blogspot.co.uk/2015/09/laptopnotebook-computer-problems.html