Hey guys, I have a (Late 2012) i7 3.4 27” iMac and when booting up and loading midway through, the Apple logo and status bar disappear and I get a prohibitory symbol. The things I’ve done to try to resolve the issue: Checked ram, all is good there. Command + R (Recovery Mode) gives me the globe & status bar and it’ll complete the status bar, Apple logo will pop and after a couple minutes, the installer “Welcome” window will show up. I click on “Use English for the main language” and the OS X Utilities window pops up. I highlight Reinstall OS X, click Continue, and OS X mountain Lion window pops up. I assume this is the OS the iMac came with. I hit Continue, I get the spinning beach ball. At this point, I need to shut down. If I click on Disk Utility, the window shows up but I get a spinning beach ball when it’s trying to gather disk information. No hard drive pops up in the left side tab of the Disk Utility window. Booting with Option + Command + R (Internet Recovery Mode) gives me the Recovery status bar and completes it. This goes directly to the Apple logo and status bar and the status bar will go to 3/4 way and restart the iMac and this will ultimately lead to the prohibitory symbol. Booting with Option button held down will bring up external USB drive with an operating system. Click on the drives OS icon, status bar will go 3/4 way and reboot again. Verbose Mode: last line reads (pci pause: SDXC) and after several seconds, the iMac gives me the prohibitory symbol. Apple Hardware Test. Probing the hardware works. Click Test, the status bar seems to pass the memory test and main logic board. but it hangs almost towards the end, around 95%. Test results only read Testing in Progress, Pass Number 1 and Total Time Testing. Each time is a different mins/secs. The mouse becomes extremely laggy. Hitting the Stop Testing or Command + Period does not work. I ran AHT various times between 10 min and 1 1/2 hours. I’ve also PRAMed and performed a SMC reset. I don’t care about the drives files, installed programs, etc. A clean installation is fine. Any advice other than to bring it to a Mac service store would really be appreciated. Thank you.