I have a 13-inch MacBook Pro from early 2011, with custom SSD & Memory upgrade.
For the last few months, the fan has been running at max speed or close to it.
To fix it, I've tried:
- Resetting the PRAM
- Resetting the SMC
- Replacing the fan
- Starting in Safe Boot mode
- Setting the fan speed manually with an app called tg Pro
These are the temperature readings outputted by tg Pro on my machine.
The only way I can silent the fans is to override the Mac's native fan control system and turn it down, but then I'd probably be damaging the internal components.
Some things that could help diagnose the problem: - When I started in Safe Boot mode, there were some visual artifacts in the form of horizontal bars going across the screen. I did a screen capture with Quicktime but strangely enough the visual artifacts were not present. These artifacts do not appear when I boot in normal mode.
I suspect it is a hardware problem and I'm three quarters tempted to schedule a rendezvous with the Apple Store but if you have anything else I could try I'm all ears.