everton

just installed a Qsee systwm (model Qsee 308) in August. Everything was working fine until a few weeks ago constantly getting "NO DISC" error. After rebooting the system the error was cleared, however few days after, the error returned. Replaced the hard drive, worked for a few days then same thing. I even installed a cooling fan believing that it was overheating but the problem still there. Any help?

hello nice to be here