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I would start here by cleaning the feed rollers but there could be several causes to this. It could be the fuser film is slipping and not getting the paper out in time thus throwing a false paper jam message. It could be the fuser isn't turning at all and not allowing the paper to enter. Normally if the paper is making it out of the tray then it isn't the feed roller but that is always the cheapest place to start. You can clean the roller(s) with an alcohol wipe or rag with alcohol on it.
Does the paper make it past the toner cartridge? I have seen toner cartridges lock up and cause this type of problem as well. If the paper isn't making it past the toner I would try replacing the cartridge (even if its with an old one just to test the paper path).
An error 50 on most HP Laserjet printer indicates the fuser has a problem. Most common problem is the heat lamp burned oou. The lamp is not a replaceable item unless you re a top notch technician. The fusing assembly however is usually a relatively easy replacement requireing only twisting of a couple of latches or removal of a couple of phillips screws.
The part # for the fusing asm for the HP LJ 3030 is RM1-0865-000CN.
These can readily be found online for anywheres from $120 to $250.
Sounds like a bad fuser. To check it out - print a few pages, as the printer prints open the cover(the one that you open to get at the toner).Remove the toner. Look at the page that is facing up. if it has streaks on it - change the toner. If it looks clean, change the fuser.
Look at the fuser, and see if you can see a bad area on the fuser roller, matching the position on the paper. I suspect a bad fuser. Fusers need to be replaced periodically, and typically via a maint kit which replaces several feed rollers as well.. How many pages have been printed.. Print a config sheet to display this information.