CHAPTER 9Troubleshooting your systemSafety first—for you and your systemCAUTION Many repairs may only be done by a certified service technician. You should onlyperform troubleshooting and simple repairs as authorized in your product documentation, or asdirected by the online or telephone service and support team. Damage due to servicing that isnot authorized by Dell is not covered by your warranty. Read and follow the safety instructionsthat are shipped with your product.l Troubleshooting system startup failure............................................................................... 202l Troubleshooting external connections................................................................................. 202l Troubleshooting the video subsystem................................................................................. 202l Troubleshooting a USB device.............................................................................................202l Troubleshooting a serial I/O device..................................................................................... 203l Troubleshooting a NIC.........................................................................................................203l Troubleshooting a wet system.............................................................................................204l Troubleshooting a damaged system.................................................................................... 205l Troubleshooting the system battery....................................................................................206l Troubleshooting power supply units.................................................................................... 206l Troubleshooting cooling problems....................................................................................... 207l Troubleshooting cooling fans...............................................................................................208l Troubleshooting system memory.........................................................................................208l Troubleshooting an internal USB key...................................................................................209l Troubleshooting an SD card................................................................................................. 210l Troubleshooting an optical drive........................................................................................... 211l Troubleshooting a hard drive................................................................................................ 211l Troubleshooting a storage controller....................................................................................212l Troubleshooting expansion cards......................................................................................... 213l Troubleshooting processors................................................................................................. 214l System messages................................................................................................................ 214Dell PowerEdge R430 Owner's Manual 201