itskuttamit

i have got a problem while installing a 160 GB HDD in avc760za DVR.when i connected the HDD and switched on the dvr it is just rebooting on its own giving a beeping sound.But when i am connecting the DVR with out the HDD it si not giving any problem and entering in its system menu automatically.I have tested the HDD connecting it to a PC and that was properly detected in Pc.please help me in this regard.please let me know where is the problem.