The 7937 requires IEEE 802.03af Class 3 Power like the 3750 supplies. What type of switch are you using when it won't power up? If using a Power Cube you will need the new 7937 Power Splitter.
The Cisco Unified Conference Station 7937G supports IEEE 802.03af Class 3, which allows powering from any of the Cisco Inline Power-capable blades and boxes. In addition, the Conference Station can be powered locally with a power supply (part number CP-PWR-CUBE-3) when combined with the Cisco Unified IP Conference Station 7937G Power Splitter.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...