If Device Manager alerts you to a resource conflict, the DMA channel you selected in the CMOS Setup program is probably already in use. Go back into Setup and select a new channel. Select the Details tab in the printer's Properties dialog box, and click the Spooling Settings button. This may speed up printing, but you'll have to wait longer to resume other computing tasks. In fact, you may not be able to print some graphics at all.
Many laser printers store an entire page before printing.
At the very least you need 512KB for printing 300 dots per inch and 1MB for 600 dpi. For complex graphics or network use, you'll want at least 2MB and preferably 4MB to handle these resolutions. Confirm that the Device Options tab in the Properties dialog box lists the correct memory settings. If Windows doesn't know about your extra memory, it can't use it. If your printer won't work at all, check to see that cables, power cords, paper trays, and switches are in their proper positions.