I have seen various problems in hp officeject and psc, most of which are related to the scanner. Bulbs going bad being the main problem there but now this one is funny. Machine came in with scanner failure, complaint is grinding noise. Easy i thought, clean the optics and replace the bulb. Nope, after doing all that the scanner still fails to find it's starting point and the motor stays engaged, hence the grinding noise. Any other suggestions on what could cause this? Model is PSC 2175 but it should not be model related.