I turned my 9 channel, 12V power supply off at the master switch and when I turned it back on after working on my DVR, none of the cameras had video. While trouble shooting I used a volt meter on the + and - posts in the box and they show 3v with any of the 8 cameras hooked to the bus bar. Unloaded it shows 12V, meaning nothing wired on the bus. Any load bogs it down. It's 4 years old and have another one coming. Has anyone seen this before? Any fix that I may not know about other than throwing it in the trash can? Thanks