回答“My MacBook Pro 13inch 2011 Back cover Display Housing Popping off”If I were you I would just replace this so it doesn’t give you fits in the long run. There is an iFixit guide and a new display assembly stocked by iFixit too. You can find the display assembly part under the parts section in the guide I will provide below. Hope this helps. MacBook Core 2 Duo Unibody Display Replacement
回答“MacBook Pro suddenly shuts down, reboots to dark blue screen?”I think this might help you out here Troubleshooting Mac Problems: Stuck at the Blue or Black Screen. It’s probably because of drive permission issues.
回答“What does this code mean?”The "E2" error code indicates a shorted thermistor. The thermistor is a component that the control board monitors in order to regulate the operating temperatures. The thermistor is a component that changes its resistance value according to temperature. If the control board does recognize a certain range of resistance of the thermistor, the control board will stop the dryer and display "E2". Sears sells the part here
回答“Can I repair internal audio?”It is possible to replace the audio jack, but there is no iFixit guide at this time for it for this machine. However there is a guide on a similar iMac machine that has the same display size, if you are willing to take chances and see if they are at all similar because I have never worked on this particular model of the iMac. Do it at your own risk!