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Those keys all do something special when Ctrl is held down, so they won't "work" as normal.
Often, Ctrl, Alt or sometimes even the Windows key being stuck down is the cause of such "some keys work, others don't, until I restart programs" problems.
Ah, then maybe your keyboard drivers are corrupt? Have you tried redownloading and installing them?
And just because a key is not PHYSICALLY APPARENT to be stuck down, especially on a chiclet laptop keyboard, it could simply be something in the membrane.
But try the driver and see what happens.
Google your PC manufacturer along with the model number of the laptop - you'll find their page where there'll undoubtably be support and drivers available for download - look for the keyboard drivers, download them and then run the installion package you downloaded.
Let us know how you get on.
Air blaster might not be all the issue, as it's likely a chiclet keyboard (the membrane could be faulty too - so you can't easily get to it).
But try to the driver thing first and see how you get on.
my PC is a replacement from the manufacture, made up of refurbished parts. could that be the problem?
Entirely possible.
Whilst generally it could be said that refurbished parts are just new ones replacing the old ones, it really depends on the manufacturer and their procedures on how they deal with refurbishments - and unless someone has some real insider info, you're probably not going to get a definite answer.
For example, I bought my daughters ipods way back when, and I went for the refurbished ones simply because the ONLY parts that were reused was the case. All internals were replaced as a matter of course.
Sony would employ a slightly similar approach with PS1s and PS2s back when I worked for the Official PS magazine.
However, many other manufacturers will do their fault testing on returns, identify the dodgy parts, then just replace those. In those cases, obviously they test pretty quickly as it's not economic to really go through them, so it's far easier to pop a couple of new parts in , test it, see it appears to be OK, but in reality there's still some faulty parts in there (such as PSU).
So, depending on what they do, it's entirely possible. Of course, if you're still under warranty it's simply a matter of returning it, but do be warned, depending on what country you live in , refurbished equipment often carries a far shorter warranty period.
I can't really tell you more than that