Bad Mac Mini 2012 passes AHT, but ASD shows several errors/failures. Logic board failure? I have a 2012 Mac mini running Mac OS X 10.8 that doesn't boot properly. Sometimes the USB ports don't work after boot and/or the Mac mini crashes after bootup. Graphics are not crisp when output from HDMI; instead resembling an old CRT TV. 

Before I did a clean install of 10.8 via Internet Recovery, it had a kernel panic/boot loop. 

So far I've:


Reset both NVRAM and SMC 
Run AHT extended tests (without problems).
Found and ran the correct ASD, which consistently shows these seven errors: 



  FireWire Controller (test #20) - Reset PCIe Link Error Registers...
  ERROR--12114 [Cannot find the PCIe capabilities register] -- TEST
  FAILED
  
  FireWire Controller (test #21) - Read PCIe Link Error Registers...
  ERROR--12114 [Cannot find the PCIe capabilities register] -- TEST
  FAILED
  
  AirPort (test #8) - Hardware Register Check Test... ERROR--12100
  [IOConnect error reading from PCI address space] -- TEST FAILED
  
  AirPort (test #9) - Wireless Module PCIe Root Port Hardware Register
  Test... ERROR--12100 [IOConnect error reading from PCI address space]
  -- TEST FAILED
  
  SATA:SATA PCI Register Test (test #1) - SATA PCI Register Test...
  ERROR--12105 [PCI driver IOService open error] -- TEST FAILED
  
  Thunderbolt (test #30) - Thunderbolt PCIe Gen2 Link Width Verification
  Test... ERROR-- 11 [Can not get PCI Link Width] -- TEST FAILED
  
  Thunderbolt (test #31) - Thunderbolt PCIe Gen2 Link Speed Verification
  Test... ERROR-- 13 [Can not get PCI Link Speed] -- TEST FAILED


Despite FireWire and Airport showing up in failures, the Mac mini works great in Target Mode and Wi-Fi seems to work fine too. Don't know what PCI errors mean practically, though I did some research about PCIe. 

ASD for the EFI passed with no problems. 

Do those errors mean this logic board is fried and I should sell this Mac mini for parts, as I assume?

The logic board is rather dusty and dirty, but doesn't appear to be a liquid spill. No idea if that could realistically cause a short.

Background: 

I tried to upgrade my problematic 2009 Mac mini on the cheap by getting one on eBay. It was listed as powering on but not booting, but I thought I had a decent chance of making it work with a good HD, good RAM, and clean install.
This machine is toast. Short of putting it on a test bench, it’ll be hard for you to figure out what’s wrong with it, and from where I sit somewhere on the planet, even harder. This computer deserves a final resting place in an electronics recycling bin.