User manual DELL DIMENSION E521

[. . . ] DellTM DimensionTM E521 Owner's Manual Service Tag cover latch release CD or DVD eject button CD or DVD activity light FlexBay for optional floppy drive or Media Card Reader microphone connector headphone connector diagnostic lights hard-drive activity light power button/ power activity light USB 2. 0 connectors (2) Model DCSM w w w. c o m Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make better use of your computer. NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death. Abbreviations and Acronyms For a complete list of abbreviations and acronyms, see the "Glossary" on page 149. If you purchased a DellTM n Series computer, any references in this document to Microsoft® Windows® operating systems are not applicable. ____________________ Information in this document is subject to change without notice. [. . . ] CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover. 1 Follow the procedures in "Before You Begin" on page 65. NOTICE: Ensure that sufficient space exists to support the removed cover. 66 Removing and Installing Parts NOTICE: Ensure that you are working on a level, protected surface to avoid scratching either the computer or the surface on which it is resting. 2 Lay your computer on its side with the computer cover facing up. 3 Pull back the cover latch release located on the top panel. 1 2 3 4 1 4 cover latch release bottom hinge tabs 2 computer cover 3 back of computer 4 Grip the sides of the computer cover and pivot the cover up, using the bottom hinge tabs as leverage points. 5 Release the cover from the hinge tabs and set it aside in a secure location. Removing and Installing Parts 67 Inside View of Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. 3 4 2 *1 5 *May not be present on all computers. 1 4 floppy drive or Media Reader system board 2 5 CD or DVD drive hard drive 3 power supply 68 Removing and Installing Parts System Board Components 1 2 3 4 22 5 6 7 20 8 19 18 17 1 16 15 2 14 13 12 11 10 3 memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4) serial ATA drive connectors (SATA0, SATA1) line-in, line-out, microphone, side surround, center, and LFE connectors (AUDIO_6_STACK) 9 21 fan connector (FAN_CPU1) processor socket (CPU) 4 7 power connector (PW_12V_A1) front-panel connector (FRONTPANEL) 5 8 serial ATA drive connectors (SATA2, SATA3) power connector (POWER1) 6 9 Removing and Installing Parts 69 10 USB connectors (2) (USB2_BACK1) 13 video connector (VIDEO1) 16 PCI Express x16 connector (SLOT1) 19 PCI connector (SLOT3) 22 floppy drive connector (FLOPPY1) 11 14 17 20 network connector and USB connectors (2) (NIC_USB1) battery socket (BT1) standby power indicator (AUX_PWR_LED) PCI connector (SLOT4) 12 15 18 21 real-time clock reset jumper (RTCRST) Internal USB connector (USB1) PCI Express x1 connector (SLOT2) password jumper (PSWD) Memory You can increase your computer memory by installing memory modules on the system board. For additional information on the type of memory supported by your computer, see "Memory" on page 111. NOTICE: Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported. 70 Removing and Installing Parts Memory Installation Guidelines · DIMM connectors must be populated in numerical order beginning with connectors DIMM_1 and DIMM_2, then connectors DIMM_3 and DIMM_4. If a single DIMM is installed, you must install it in connector DIMM_1. · For best performance, memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed in matched pairs, the computer will operate, but with a slight reduction in performance. (See the label on the module to determine the module's capacity. ) For example, if you install a mixed pair of DDR2 533-MHz and DDR2 667-MHz memory, the modules function at the slowest speed installed. 2 1 1 Channel A: matched pair of memory modules in connectors DIMM_1 and DIMM_2 (white securing clips) 2 Channel B: matched pair of memory modules in connectors DIMM_3 and DIMM_4 (black securing clips) NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module. Otherwise, your computer may not start properly. You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM connectors 3 and 4. NOTE: Memory purchased from Dell is covered under your computer warranty. Removing and Installing Parts 71 Addressing Memory With 4-GB Configurations Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current 32-bit operating systems, such as Microsoft® Windows® XP can use a maximum of 4 GB of address , space; however, the amount of memory available to the operating system is less than that installed. Certain components within the computer require address space in the 4-GB range. Any address space reserved for these components cannot be used by computer memory. Installing Memory CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. [. . . ] If the computer is infected, the boot virus may replicate itself onto all the floppy disks that are read or written in that computer until the virus is eradicated. V -- volt -- The measurement of electric potential or electromotive force. One V appears across a resistance of 1 ohm when a current of 1 ampere flows through that resistance. write-protected -- Files or media that cannot be changed. Use write-protection when you want to protect data from being changed or destroyed. [. . . ]