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Jul 9, 2015 9:04 PM in response to NemanjaOSby Drew Reece,See this…
Computers that can be upgraded to use OS X Internet Recovery - Apple Support
Apple hardware test will only work if the Mac was 'upgraded' from the original shipping OS. When you erase & clean install the Apple hardware test is usually wiped. You can download Apple hardware test if you want it, but it can be a pain to install correctly. If you have original disks use them, one will have instructions for running Apple Hardware Test.
Using Apple Hardware Test - Apple Support
This page lists the many versions of AHT with hints on how to tell your model…
https://github.com/upekkha/AppleHardwareTest
Recovery mode will only work if the installer created a recovery partition.
'Zapping the PRAM' should work on all models, confirm you are doing it correctly…