I recently tried to start my optiplex 755 sf after my power supply finally decided to die on my good computer and i got a beep code. The only thing out of the ordinary on it is theres a gigabyte gv-nx86t256h in the pci-e x16 slot(only put it in so i get opengl and shader model 4) and the cover for it is off(so the gpu fits in it). Also changed the ram to 8g. Nothing else has changed. I tried with out the gpu but still got the same beeps. I have no clue whatsoever this means so i hope someone else can understand it. Here's the link to recording(Might need vlc, google it if you don't have it).