45Solving ProblemsBeep Code Possible ProblemOne Possible motherboard failure -BIOS ROM checksum failureTwo No RAM detectedNOTE: If you installed orreplaced the memory module,ensure that the memory moduleis seated properly.Three Possible motherboard failure -Chipset errorFour RAM read/write failureFive Real Time Clock failureSix Video card or chip failureSeven Processor failureEight Display failure.Network ProblemsWireless ConnectionsIf the wireless network connection is lost —The wireless router is offline or wireless hasbeen disabled on the computer.Check your wireless router to ensure it is•powered on and connected to your datasource (cable modem or network hub).Ensure that wireless is enabled (see “Enable•or Disable Wireless” on page 12).Re-establish your connection to the•wireless router (see ”Setting Up a WirelessConnection” on page 15).Interference may be blocking or interrupting•your wireless connection. Try moving thecomputer closer to your wireless router.Wired ConnectionsIf the network connection is lost — The cableis loose or damaged.Check the cable to ensure it is plugged in•and not damaged.