Replaced hp cd writer 7200 which never seemed to work with a phillips 1200 series burner.Discharged static before opening cabinet and paid attention to cables and placement,believe I have all correct.Restarted machine and get only a rapid click and flash from lights,monitor,keyboard,speakers,etc...fan attempts to start in rythmn to these clicks.Computer will not turn off when switch is pressed,only way is to unplug it and clicking stops in about two seconds.Tried reinstalling previous drive,still clicks.Disconnected all cables to all drives (2 cd,hard,floppy)still clicks.Baffled....did I cook power supply or worse?