Two young men charged in the murder of a Staten Island hip-hop DJ pleaded not guilty yesterday — despite investigators’ insistence that they confessed while under interrogation, authorities said yesterday.

William Williams, 21, and Richard Cromwell, 20, were arraigned on murder, weapon-possession and attempted-robbery charges.

Prosecutors say surveillance video shows them shooting Corey McGriff, a k a DJ Megatron on WQHT-FM Hot 97 radio, and swiping his watch and cellphone on March 27 near his front door in Clifton.