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Solution: The system often ships with an underpowered AC adapter. Often, it ships with [[AC_DC_Adapter_Reference#Leader_Electronics_Inc_I.T.E._Power_Supply|this adapter]] which fails to provide enough amps for the hard drive. The drive will fail to spin up so it will not be detected by the unit. 750mA is not enough. Substitute another 12v power supply of the correct connector typeSolution 1: The system often ships with an underpowered AC adapter. Often, it ships with [[AC_DC_Adapter_Reference#Leader_Electronics_Inc_I.T.E._Power_Supply|the model MT20-21120-A00F]] which fails to provide enough amps for the hard drive. The drive will fail to spin up so it will not be detected by the unit. 750mA is not enough. Substitute another 12v power supply of the correct connector type 2.5 x 5.5 x 9.5 mm positive tip. Recommend using a power supply around 2 amps or more. [[File:MT20-21120-A00F.png]]<BR>''Illustration: Model MT20-21120-A00F AC Adapter''. Solution 2: The manufacturer recommends Seagate SATA drives of 500GB or larger. Make sure you are using a known to be functional SATA drive. The system may not detect the drive if the drive is defective. A defective drive or incompatible drive will not be detected. Another possible cause is a faulty SATA controller on the DVR, which means the DVR would need to be serviced or replaced. Problem: No audio on system monitor. Solution 1: