Use only VESA 1.1a compliant Mini DisplayPort to DisplayPort adapters. Check with the manufacturer of the cable or consult the documentation included with it to determine if the cable is VESA 1.1a compliant.
Certain cables advertised as being VESA 1.1a compliant may contain a construction issue that may result in the DisplayPort power pins at either end of the cable shorting together. VESA 1.1a compliant cables must isolate the DisplayPort power pins at either end of the cable.
To learn more about the VESA 1.1a DisplayPort Interoperability Guidelines, visit www.vesa.org.