I would normally put this down to Call-Centre-itis, but on this occasion the reason is because the laptop is under warranty.
As part of the procedure to cover their donkeys, the service department will run the machine through the full diagnostic routine to make sure everything is working and identified before it is returned. This is to prevent scams whereby the hustler will swap parts on return, claim it came back with something missing, claim it was received back faulty and demand another repair, replacement machine, or even try for a refund depending on the circumstances (if the laptop was stolen, this launders it).
Similar thing happened to me a while back, but I've no idea how. In my case it was the Esc key - I pressed it, and it just slid away from under my finger. Real fiddly to fix - the mechanical part was fine, and I could re-assemble that after a little practice, but the rubber bubble that served as a spring and contact actuator was a different story, being only 0.1 mm thick, and sandwiched between two similar thicknesses of plastic sheet, which gave it a slight pretension. I think it was bonded to the bottom one, and the bond had failed, letting it slip through.
Since I refitted it, it's worked fine, if feeling a tad different to the others. I spot of adhesive might tighten it up, but I draw the line at trying to slip a mere whiff of cyano onto something the size of large pinhead, nipped between two sheets of plastic that are supposed to be separate.
If the laptop's out of warranty, but a good 'un, then keyboard, or even screen failure is not a disaster, since you can always plug in a desktop keyboard or screen, and just use it like a desktop, but which can be moved easily. |