i'm totally confused...
I've heard that CRT has very large voltages inside...( more than Mains)
Would it be causing that?
Usually around 25,000V - it's 'caused' by a transformer.
It'll cause me a severe tingle every time i touch USB/Screen... So what would you say?
I'm also sure that my multimeter is TRUE...
I would say a slight tingle, assuming there's no fault of course - and the slight tingle is within permitted limits - after all the units have to pass strict safety standards (at least in the UK).
Why don't you just ground it? - or is the problem that the unit is grounded, and you're statically charged, and discharging every time you touch it?.