2011 i5 2.5 mac mini + pixelated screen and crashes

Discussion in 'Mac mini' started by deano59, May 20, 2015.

  1. deano59 macrumors newbie

    May 20, 2015
    Hi - my mac mini began to pixelate and freeze after 10 minutes of use 4 months ago. However, once I powered it up a few times after crashing it would eventually stay working.

    The last time I got it to work I didn't turn it off for a month and if worked flawlessly - which is very strange. I only turned it off because I moved house.

    However, it now crashes after 10 minutes - the screen becomes pixelated and there is even a pixelated box over the cursor which sometimes stops working completlely. No matter how many times I turn it on or off it won't work for longer than 10 minutes and sometimes the screen goes black when it crashes.

    Does anyone have any ideas in relation to fixing this problem.
  2. grcar Suspended


    Sep 28, 2014
    progressive failure from overheating

    Hi, You are seeing progressive failure from overheating the machine a while back. I had/have the same macmini5,2. I ran it pretty hard and the fan really cranked up but I figured Apple knows what they are doing. Not! One day in light use the machine froze. When I rebooted I got the white screen of death. I took it in to a local repair shop that I trust because you have to wait a week for a genius bar appointment. The tech reset the pram, checked the disk and did some other things like exchanging the memory cards. Each time the machine would power up and we could log in, but the white screen of death came earlier and earlier. Last time the cursor turned into the green-yellow-red horizontal lines and the screen got black horizontal stripes. Burned out graphics chip. A new logic board from Apple costs $409 plus maybe $100 to have your tech install it. So you might as well buy a new used machine on Ebay. The problem is the case is too small to properly cool the chips with fans and heat sinks. The macmini5,2 is the last one with a separate not-intel graphics system. My guess that chip is not cooled with the cpu.
  3. deano59 thread starter macrumors newbie

    May 20, 2015
    Hi - I swapped out the ram - had 8gb in there and went back to the original 4gb that came with it - didn't make a difference yesterday but - turns out It seems to work flawlessly today - fingers crossed it's just a ram issue - what do you think?
  4. grcar Suspended


    Sep 28, 2014
    Pls let me no

    Hi deano, Please let me know if you have fixed your problem! I may try that with mine.
  5. Celerondon macrumors 6502a


    Oct 17, 2013
    Southern Cal
    I think not! Are you certain that the problem persisted after you changed the RAM but afterward it improved overnight? If your RAM caused the problem then changing it should have solved the problem right away.
  6. paulrbeers macrumors 68040

    Dec 17, 2009
    Always check the RAM. It seems to fail more than people realize.
  7. venom600 macrumors 6502a

    Mar 23, 2003
    Los Angeles, CA
    Same thing just started happening to mine. It always ran hot, over 200f and the fans would come on at the drop of a hat full blast. I firmly believe it overheated... two hard drives and that Radeon in that tiny case was too much for the cooling system .

    Anyway, screen comes on with wide vertical lines, it gets partway through booting and either just sits there are restarts itself. I was quoted $549 for the motherboard from a friend who runs an Apple Authorized repair shop, so that isn't an option.

    I don't like my options for replacing it. I can either pick up an open boxed 1.4ghz 2014 model at Microcenter for $339, or try my luck on craigslist and attempt to find a 2012 model.
  8. gostfhery macrumors newbie

    May 29, 2015
    two hard drives and that Radeon in that tiny case was too much for the cooling system .[​IMG]

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