Just one tip: if cleaning screen, use the correct cleaning fluid. I have seen laptops and monitors which have actually been "cleaned" with detergent, washing up liquid and worst of all, an abrasive 'scourer' type cleaner.
Get the proper kit, marked as LCD/LED screen cleaner - usually comes with a small brush and pump spray bottle, with a special pad or cloth to wipe dry. Also cleans spectacles, LCD/LED TV, etc. Gives a lovely finish to a laptop case, as well!
I once had a very cheap & nasty "Hansol" 17" monitor, which lasted only 19 months before it packed up. Stripped it, found the internal power coil as described by the Texas gentleman above. Tried to source a replacement, price was almost as much as a new monitor.
MORAL: you get what you pay for. Replaced it with a Hannspree 19", which I had for 3 years and my grandson now has in daily Gaming use for another 2 years.