I'm pretty new to this forum and couldn't find the server sub section.
Anyway... I was using technical preview 1 on HP ML310e Gen2 with activated Hyper-V but since Technical Preview 2 it's not working anymore. Turns out the latest windows 10 build 10130 has the same issue.
Fresh install both OSEs but after activating Hyper-V role they won't come back. First reboot were triggered as usual but than at the second restart the spinner will be endless.
To be as clear as possible.
These both testing systems ran windows 2012 R2 and preview 1 with Hyper-V very smooth for months. Preview 2 and windows 10 are fresh installed. I also installed 2012 r2 again to re check that. Runs smooth as before.
Unfortuenately all my small test systems are ml301e gen2 and now they are useless. 😞
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