I have a Keithley 2001 DMM that has been dropped during transit after getting it calibrated and now the unit will not complete the boot up cycle. There is fan spin on the rear of the unit so the power supply seems to work but nothing on the display. After a quick peak inside nothing seems out of place or even busted. Any tips on what components are susceptible to hard drops or where to check first would be appreciated(Already checked and reseated all cable connections).