I Took my mid 2011 Mac bought in March 2012 to Apple Store at Village pointe Omaha at 4.30pm my case id 747399216 the genius connected it to a V7 17 inch monitor and told my logic board is dead!

even though I told him it was working each time I booted with Pram reset by comm and + option + p +r he snubbed!

HE simply connected a Mac air through the same Thunder bolt to via and say see this laptop display is picked up by the v7 monitor yours is blank because the display is dead. I told him I was using a hdmi to a Visio 26"tv at 1360x768 resolution at 60 hz and never uused any adapters he won't listen.

I did contest him how he can expect a Mac mini to adjust to a new external display like that of a laptop, as laptops do adapt since they need to plug to any projection output. He simply joked what difference both are computers!

i Also reasoned why they don't change the pram battery as it is 3 years old and apple puts in only a regular CR2032 battery! He again snubbed " no in your case it doesn't seem to be the problem". You see the logic board I'd dead, it's the most expensive of this least expensive Mac mini either pay $300for the board and $90 for the labour total $390 and you will get it in 7 days as I have to order it, Alternatively buy a new 2014 Mac mini for $499 only, only thing is you can't put RAM into it as it's not removable! Consider your options and let me know!".

At this moment I decided to try the battery replacement myself told him I will think over and come back in 1-3 days. I headed straight to L street Walmart picked up TS99818A ultra tough ultra steel 44 piece precision screwdriver bits set $6.97 and energizer 2 pack CR2032 batteries $4.97 so with taxes for less than $12, I wanted to fix it myself!

Mac mini Mid 2011 I used the instructions and in 1hour as I was over cautious, I got it done! Plugged in and switched on not even the lights came on! Then I opened again to know I forgot to plug the fan connector. So did that and finally closed the box and plugged hdmi and power cord, well I say the white screen then the Normal Mac boot it was fixed!

I did login and play a few itunes videos, then you tube, rebooted, shutdown multiple times in various intervals to be very sure.

Waited over night and tried today morning 2/15 and it is working just as normal!

I just would say Apple check your Genius's IQ please we can't be paying for their dumb brains!

All who face this problem of pink and white vertical stripes, pink and white bars, pink and white lines with AHT no problem, change your PRAM batteries! 2011 models the PRAM dies in 2014-2015 that is all you need fixing, if apple can't help you can do it yourself!

Thanks and Regards,

Shankar Raj.J