Hi have checked power supply across the molex connector have the 5v but only 7.2 on last one. It's still the original hdd but it just stopped recording when memory was full, was also on overwrite but system failed,did also try powering up hard drive with external supply but no luck still saying no HDD. Just powered up my computer harddrives with the external power supply and you hear them starting up but nothing with my cctv hdd (fault )?