Apple Hardware Test freeze on MBP 15 mid 2012

I changed the ram on my new mbp 15 mid 2012 from 4gb to 16gb. Now AHT freeze on Testing Memory with both type of ram, why? It's not my first time when I change ram, I'm on my 4th MBP. Any ideas? tks

Hi,
there is a known problem (I know it for sure from a friend that works at a apple service) with non retina mid 2012 macbook pros not responding in AHT test, most likely your RAM is fine. Just do MemTest and see if anything's wrong with it.
FYI
Reported this problem in bug reporter some time ago, the answer:
Engineering has determined that there are no plans to address this issue.
Clearley they know about it and don't want to solve it, to bad.

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You can also inspect the RAM sticks for any signs of physical damage. It's rare, but it does happen, that you'll see some kind of residue that looks like it came out of one of the chips. It's usually white in color, but it doesn't have to be. Electricians and what not tend to call that "letting the smoke out" of a chip. If you see anything like that, you know that bit of RAM is dead.
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Klawder1 wrote:
. We were however able to get into recovery mood if that counts for anything.
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Usermagic wrote:
Ok, I tried it but the disc is damaged and can not be read.
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Re
extract from kb article
PPPoE (where there is no router handling the PPPoE connection)
No
No
Captive-Networks (where you click an "Agree" button to access the Internet)
Yes
No
Proxies (where specific proxy servers must be configured in network preferences)
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