Have you also tried hoovering the fan on your CPU? I had the same issue a couple of weeks ago and found my CPU looked disgusting! I took the nozzle of a hoover, removed the fan on the CPU and hoovered near the CPU itself. It was amazing! It's helped in the meantime until I can find a clever person who can fit my new fan...the connectors don't match anything I have!!!!
Also, I'm curious...what can't you do right now? I'm lacking the context of your
thread and if curiosity killed the cat and satisfaction brought it back, revive poor kitty!!!!x