This problem persists only in fastboot mode.
Yellow triangle, unknown device as always. (In device manager it shows up as My HTC)
What i tried until this:
-3 different USB port (1 of them is 2.0)
-4 different drivers (including official HTC Win8 x64 drivers, Win7 x64 drivers by old.splatterhand, and 2 other drivers from random sites)
-Retail USB Cable and a random noname pink colored USB cable
-HTC Sync and HTC Sync Manager installed
-Google SDK installed
-drivers and updates in android SDK installed
-of course I turned driver signature enforcement and antivirus off.
It's not the first case when i have this problem. I had some Xperia phones before SV, none of them was able to connect to my PC. Probably because of drivers. Or because of my PC? My previous PC with Win7 x64 worked like charm, but that was a Desktop PC.
Thanks in advance.