USB two front-panel and five back-panel USB2.0-compliant connectorsAudio five connectors for line-in, line-out,microphone/ side-surround, surround,and center/subwoofer connector (LFEchannel); two front-panel connectors forheadphones and microphoneSystem board connectors:Primary IDE drive one 40-pin connectorSerial ATA two 7-pin connectorsFlexBay Drive one USB 10-pin header for optional MediaCard Reader (3.5-inch bay device)Floppy drive one 33-pin connectorFan one 5-pin connectorPCI 2.3 two 120-pin connectorsPCI Express x1 one 36-pin connectorPCI Express x16 one 164-pin connectorControls and LightsPower button push buttonPower light green light — Blinking green in sleepstate; solid green for power-on state.amber light — Blinking amber indicates aproblem with the power supply inside thecomputer. If the system cannot boot andthere is a solid amber light, this indicatesa problem with the system board (see"Power Problems" in your computerOwner's Manual).Hard-drive access light greenLink integrity light (on integrated networkadapter)green light — A good connection existsbetween a 10-Mbps network and thecomputer.orange light — A good connection existsbetween a 100-Mbps network and thecomputer.off (no light) — The computer is notdetecting a physical connection to thenetwork.Activity light (on integrated networkadapter)yellow blinking lightDiagnostic lights four lights on the front panel (see"Diagnostic Lights")Standby power light AUX_PWR on the system boardPowerDC power supply:Wattage 305 W