Re: I have a HP LJ M9050mfp that gets a intermittent error 55.04.08.

HP LJ 9050 Error codes:

http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?spf_p.tpst=kbDocDisplay&spf_p.prp_kbDocDisplay=wsrp-navigationalState%3DdocId%253Demr_na-bpl11265-3%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken

55.xx PRINTER ERROR alternates with TO CONTINUE TOUCH CONTINUE

1. Touch Continue

2. If the error does not clear, turn the product off, and then turn the product back on

3. If a message persists after performing all of the recommended actions, contact an authorized HP Service or Support Provider: Click here for information on contacting HP Customer Care

Let's assume you have already discovered and attempted this solution from HP.

These guys suggest the following:

http://www.advancedlaser-hp-error-codes.com/error_55.htm

HP LASER PRINTER 9000, 9040, 9050MFP
1. Temporary error. 
2. Reseat formatter, DIMMs and EIO cards.
3. Perform an engine test.

4. Perform a service test.

5. Replace D.C. controller board

6. Replace the formatter board.