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The HP 2550 does take a while to print. It calibrates through all the cartridges & then you'll see your print soon after. You probably need your printer professionally cleaned out with a toner vacuum, the squeaking could be coming from the drum or a pick up roller.
Press the Go and Rotate Carousel buttons simultaneously. This will calibrate the printer. See if this works.
Otherwise....Remove all cartridges and drum. Switch off printer. Close the lid. Switch on printer and wait until any churning stops. Insert the drum and close the lid. Wait until any churning stops. Put in one cartridge at a time, closing the lid and wait till it stops churning each time. With the last cartridge put in, it will churning longer (calibrating). Try to print from your computer.
It could also be that the toner could actually have run out for the other colors.
Check the black toner cartridge. Most printers that use multiple cartridges will use the black cartridge as long as it has toner in it but will then start using the color toner to do the black/grayscale when the black cartridge is empty.