To be fair, TS mentioned that he doesn't want to hear the keys being pressed which I'd guess would rule any mechanical keyboards right out.
There are some mechanical switches that do not make noise. A friend of mine uses cherry mx reds and modded them with these rubber rings under them to reduce the sound of them bottoming out. The only real noise you hear in reds is the bottoming out of the keys. If the OP was interested, he could get Reds with the mod. Otherwise, go buy a dell membrane board for like 20 dollars. Unless you want some perks like backlit keys. It really all depends on what OP is looking for.
Yeah I tried 2 k750 solar keyboards and both of them didn't work. I called logitech and they couldn't help me. I looked online to see if anyone had the same problem, couldn't find anything. my friend had trouble getting the solar app to work but all he did was uninstall and re-installed and it worked just fine. For me not so much. I was hoping it was gonna work getting a new one maybe thinking it was just a bad keyboard. but not. now i'm thinking its my computer.
But ok say I do get a mechanical. which would be best? it doesn't have to have a screen. im not gonna be looking at it. i was at best buy the other day and I checked out the Razer - BlackWidow Ultimate 2013 Elite Mechanical and when I pressed on the keys it sounds like morse code.
Well you said you don't want loud keys. Is that a major concern? If not I would look up a couple different videos on youtube to see the different switch types. Main ones are Cherry mx red, blue, brown, and brown.