Mac mini crashing when booting up

Hi, does anyone know why the mac mini crashes at bootup. it gets teh strart up ping, then the loading screen, then the harddrive turns off. any ideas why this is happening

I had a similar problem recently, my mini froze during a backup, held the power button down left it for a few mins and rebooted, only got the grey screen with apple logo and the spinning gear and that was it, could not get past that so I installed OS X on an external drive, the internal HDD took upto 10 mins to mount then vanished copletely a day or so later, in the mean time the optical drive stopped working as well!!, took it to the Apple store who thought it ws a dodgy interconnect board, but they called yesterday to say that both the hard drive and optical have conked out, and that the machine was packed full of dust, and possibly caused everything to overheat!! (am allergic to dust so keep my flat quite clean!!), to replace both costs about the same as a new machine so not worth it!. So off to collect it today and buy a new one. Have had the machine barely 2 years! and thought it would outlive my Dell PC!

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Mac Mini crashes when HDMI-connected AV receiver powered off

This issue concerns a Mac Mini, mid 2011, running Yosemite. It is connected to a Yamaha AV receiver using HDMI and under normal circumstances works normally. However, whenever I power off the AV receiver, the Mac Mini crashes (spontaneously restarts).
I can't find any trace of a kernel panic, and there is no message after startup to say that the system has restarted unexpectedly.
For example, the system log from last night shows that is was performing a backup, and then there's the boot message at the time I shut the AV receiver down:
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I have swapped out the HDMI cable in case it is faulty, but this has not changed anything. This issue is easily reproducible but I haven't been able to find any possible solutions. It started after the Yosemite upgrade. Also, the AV receiver need not be displaying the Mac Mini video for this to occur. It will crash regardless of what channel the receiver is showing.
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I have a similar issue after recently buying a receiver (Sony STR-DN1050) and wiring my mac mini through it.
Some observations that seems to be linked.
1. When I power up the receiver with another hdmi input than the mac mini, the mac mini switches fast between displays, from the TV name to unknown (observed through Remote Desktop), and sometimes log out the user.
2. Then, when switching to the mac mini hdmi input, everything works fine, as the mac will recognise the TV.
3. When switching off the receiver, the remote desktop disconnects and usually the mac mini will log off user or restart- not sure which.
Edit: Right now, when I powered off the receiver, the mac stayed on... no idea why, as it usually disconnects as mentioned above.
Edit2: As I look in the Display settings, the mac now recognizes my receiver as Display when it is turned off, presumably because I turned off HDMI pass-through on the receiver settings.
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Mac Mini crashes when exporting imovie projects

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When I try to export imovie projects, my Mac Mini crashes. Not ever, just every two or three times.
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Thank you, I'll try!
I hope you're right, because is boring to see out of the blue all the screen getting grey and the window that invites you to reboot, without hope... It happens, for example, after two or three succesful exporting projects, then I reboot and go on for another two or three projects and then again... I'm afraid it's a RAM problem, but I'll try to update system and software.
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Mac Mini crashes when I attempt to boot to OS Disc

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Mac Mini crashes when connected to USB mouse!

This problem just happened all of the sudden--I came into my office a few days ago and there was the multi-lingual screen of death telling me I needed to restart my computer. Tried numerous times, no success--same message.
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Message was edited by: Yijian Cao

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Next, I'd like to correct my original message. The memory is "Kingston", not "Kensington". (I was working from memory, and that doesn't always work so well.)
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Fix The Bugs Please wrote:
It is unlikely to be a hardware failure as the Mac Mini was made in May 2014 and I bought factory refurbished. It seems to be an issue relating to the SSD as it boots other drives.
Any ideas?
Is this SSD an additional drive added to your Mac Mini or did you replace the HDD with it? If it's an additional drive and since it's a Samsung, depending where you purchased your drive doubler kit (iFixit or OWC) you can try swapping the drives in the bays. I know for a fact that Samsung SSDs do not work right with the iFixit drive doubler kit's SATA cable. But it does work correctly with the Apple supplied SATA cable. If it's the OWC SATA cable, I know for a fact those are much more reliable with Samsung, OWC, Intel, Crucial SSDs. Another thing, I would NOT enable TRIM (my opinion) using a 3rd party trim enabler if you're running Yosemite. There are issues with trim enablers and Yosemite. Just let the built-in Garbage Collection take care of things.
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Mac mini crashing when booting up

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