After replacing the ink cartridges on my printer DELL photo all-in-on printer 926 is no longer operating. It is turned on. She said at first that a worksheet is locked, nothing out of blocks. Then she shows how the alignment prints, nothing happens and I cannot access the control menu. I disconnected and reconnected everything: nothing happens this is the first time it fails me. I tried to update the firmware on the Dell 1235cn MFP and now all I get is the status window of rapid warming please wait. How I can return to the factory default printer.