I installed a secondary hard drive to my pc. Added it to one of the empty bays connected all the cables. Blew the dust out while I had it opened, closed it up, reconnected everything. Went to turn it on and I get lights, hear the fan see the hard drive light, but the monitor says no signal. So I check all connections and try again...same results. So I remove the new hard drive check everything...still no boot up. Help Please.