30 Quick Reference Guidew w w . d e l l . c o m | s u p p o r t . d e l l . c o m Before You Start TestingCAUTION: Before you begin any of the procedures in this section, follow the safety instructionsin the Product Information Guide.• Turn on your printer if one is attached.• Enter system setup, review your computer’s configuration information, and enable all of yourcomputer’s components and devices, such as connectors.Beep CodesYour computer might emit a series of beeps that can identify a problem. One possible series(code 1-3-1) consists of one beep, a burst of three beeps, and then one beep. This series tell youthat the computer encountered a memory problem.If a beep code is emitted, write it down and look it up in the following table.Code Cause1-1-2 Microprocessor register failure1-1-3 NVRAM read/write failure1-1-4 ROM BIOS checksum failure1-2-1 Programmable interval timer failure1-2-2 DMA initialization failure1-2-3 DMA page register read/write failure1-3 Video Memory Test failure1-3-1 through 2-4-4 Memory not being properly identified or used3-1-1 Slave DMA register failure3-1-2 Master DMA register failure3-1-3 Master interrupt mask register failure3-1-4 Slave interrupt mask register failure3-2-2 Interrupt vector loading failure3-2-4 Keyboard Controller Test failure3-3-1 NVRAM power loss3-3-2 Invalid NVRAM configuration3-3-4 Video Memory Test failure3-4-1 Screen initialization failure3-4-2 Screen retrace failure3-4-3 Search for video ROM failure