I'm not sure what my next step should be and could do with some advice. A few weeks back my Mac mini's fans starting spinning up to 5,400 rpm whilst not under any great load. I took it to an Apple Authorised Service Provider (also mentioning to them that the bluetooth mouse and keyboard disconnect from time to time). They replaced the logic board and bluetooth card. But the fans were still spinning a lot. I reinstalled the operating system but the fans spun more and more until they were again going up to 5,400 rpm for it seemed no particular reason. Also I was being disconnected from the internet from time to time (which was remedied by running Network Diagnostics which either just said everything was fine or that the network settings had changed) and the computer stopped responding to certain mouse inputs from time to time. I called Applecare. They had me reset certain things and sent a new mouse. The situation did not improve. I took it to an Apple Store. They ran diagnostic loops to check sensors and an internet load test. They found nothing wrong and expect me to now pick up the computer. I'm not sure what to do as before I dropped it off the fans were so loud and fast that I was afraid to use the computer for long. What do you think I should do now?