3 keyboard keys malfunction

[farey]

Something strange happened to my MacBook's keyboard: Backspace, one key on the left from it and one key left under it -parenthesis- stopped working. When I restart, MacBook is beeping like I was pressing some keys repeatedly for a few seconds. When I press some other keys -all other work- it stops beeping and works correctly. I tried to clean the keyboard, even connect it from the mainboard and then reconnect it again. Nothing helps, the three keys still do not work. Seems not to be a hardware-related problem... but who know? Any ideas please? I miss backspace a lot [:
PS: PLUS there's this strange occurence with trackpad - it stopped understanding the secondary mouse button two finger gesture -althrough it's allowed in the preferences panel-

 

[Detrius]

Sounds like someone spilled something on the machine. If there's no spill, and it's an older MacBook with cracking around the edges, you could get the top case replaced under the existing Repair Extension Program.