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There are several things that can cause this. But first, what was the problem that you replaced the drum about?
Just re-seating the drum, and checking for spilled toner before you put it back in after removing it briefly, esp. spilled toner on any metal surface, contact, or spindle, might cure the problem.
When replacing the drum, you might have either not quite seated it, and the toner cartridge, quite right and quite in-place. Or there might be spilled toner on a high-voltage supply contact, which if obscured by toner, would not transmit high-voltage to the right place, causing the black pages.
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Just try what I said, please. Thanks.