I have a strange case of hardware failure that I wanted to both share and receive thoughts on. I have an appointment scheduled with the Genius Bar in a few hours and so will hopefully be able to provide a conclusion to the case, but I'd appreciate the community's thoughts on it in order to make sure that nothing is overlooked (or that the Genius doesn't take me for a ride). The system is a Mac Mini 2012, refurbished model that is still under Applecare. There were two old LCDs connected to it, one via DVI to HDMI adapter, the other via VGA to DisplayPort adapter. Keyboard and mouse connections were via USB. We noted this morning that the display connected through HDMI wasn't displaying anything. The display connected through DisplayPort was working, but the resolution had reverted to 1024x768 (the monitor's native resolution is 1280x1024). The monitor model was still correctly identified by the system. The correct resolution could be selected, but it seemed strange that the system was choosing the incorrect resolution when it had no issues for months leading up to now. I attempted to reboot the system, which led to the startup tone being repeated while nothing showed on either screen. To be specific, the tone would sound, there would be approximately one second of silence, and then the tone would sound again. I shut down the system, waited for 20-30 seconds, and then powered it on. It started up with no difficulty, but the HDMI monitor still wasn't working. I ran a system update (OS X 10.9.3 to 10.9.4) and restarted the system. I again received the tone loop. This time, however, I could not get past it. According to a guide about startup tones from Apple, startup tones spaced five seconds apart is diagnostic of no RAM being detected. I timed the tones and found that they were closer to four seconds (counting from the start of one tone to the start of another). I have one upgraded stick of RAM in the Mini; I changed the RAM slot and then swapped back for the original RAM, but the startup tones were unchanged each time. I attempted a PRAM reset, which caused the startup tone to sound louder but otherwise did nothing. It seems like a case of hardware failure, and I can't think of anything more to do on my end to diagnose and/or fix it. Interestingly, the monitor connected by HDMI also seems to have failed. I swapped the adapter for a DVI to DisplayPort adapter and attempted to connect it to my MacBook Pro. The system couldn't see it, and the monitor behaved strangely. Its power indicator showed that it had come out of sleep mode (it stopped flashing orange), but it didn't turn green to indicate that it had powered on. It remained blank, and pressing the power button had no effect. It's a very strange coincidence that both a monitor and computer should experience operational problems at the same time, but as far as I know neither should be capable of inducing failure in the other. All of the components are wired into the same surge protector, along with a few other electronics that don't seem to have any issues. Thoughts as to the issue are appreciated. I'll reply back with what Apple determines after they take a look at the system in a few hours.