Hi,
Your post is correct that error 53 refers to bad memory board or at times defective SIMM only. Since you have replaced them and no change, you may want to try to do a Cold Reset of the printer. This is done by powering on the printer while holding down the GO or Online button. Additionally, you may want to check/reset your NVRAM settings which can be done manually through the Service Mode.
This
page lists most of the HP Laser Printer error codes. This
link displays most HP LaserJets - Cold Reset Instructions.
Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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