But your ESXi version is ESXi 5.0!
Am I wrong?
This is correct yes, but we have no issues building Windows 7 / Windows 2008 R2 / Windows XP also.
I've read the documents but I didn't install WS2012 on ESXi 5.0. I did install W8 Preview Release.
It was working fine, even with VMware View and PCoIP. But if it's possible for you, upgrade to ESXi 5.1 U1.
Because it's not fully supported by ESXi 5.0.
Follow below steps :-
1. Type cmd - SConfig >> Enter >> check if any option to get GUI. >> try that option.
2. If no option with GUI >>> exit then try below cmd...
DISM.exe /online /enable-feature /all /featurename:NetFx4
DISM.exe /online /enable-feature /all /featurename:MicrosoftWindowsPowerShell
powershell (It should show PS , if not reboot server once and then see powershell - PS)
Install-WindowsFeature Server-Gui-Shell, Server-Gui-Mgmt-Infra
Shutdown -r (for reboot server) >> after reboot server will come back