It's not like it's always dead, at times it lights up, at times it fluctuates (brightly lit==>dimly lit), and at times it won't light up at all.
The issue is present in the BIOS screen as well.
It looked like a loose connection, so I took the keyboard out of the laptop, the ribbon cable at the keyboard end is fixed - nothing I could do about that, but I cleaned the other end of the cable (the end that connects to the motherboard) using a 91% alcohol solution (the one you use to get thermal grease off your CPU), I also cleaned the connector port on the motherboard where this cable goes in (using a hair drier, not alcohol), but the problem persists.
The key itself works, when I press the capslock, althought the light doesn't come up, but the keyboard starts typing in capital letters. When I press it again, it starts typing lower case.
What could be the problem? Will purchasing a new keyboard solve this? Or is this a motherboard issue?
Original keyboards are kinda expensive, and i don't really want to get a knock-off from ebay, just want to make sure I won't be wasting money by purchasing a new one..
The laptop is an HP probook 4530s.