HP 500B - Manual (Page 24)

6. If you are removing a graphics card, press on the latch to release it.
Figure 2-15 Press the latch to release the graphics card
7. Remove the graphics card from the card slot.
NOTE: If you are removing a PCI Express x16 card, pull the retention arm on the back of the
expansion socket away from the card and carefully rock the card back and forth until the
connectors pull free from the socket. Be sure not to scrape the card against the other
components.
Figure 2-16 Removing the graphics card from the slot
16 Chapter 2 Removal and Replacement Procedures Microtower (MT) Chassis