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I don't understand the beep code you describe, but the 2850 has many beep codes to help understand what is going on.
First ... Identify the beep. Does the beep start as soon as you power it on, or after several seconds? What is the pattern of the beep - is it a repeating set of beeps - 3 sets of beeps between 1 and 4 beeps ... like 1 beep-3 beeps-2 beeps, or 3 beeps, 3 beeps, 1 beep? Or is it a steady repeating beep - about once per second?
Second ... is the LCD panel on the server blue or orange? If orange, what is the error code(s) it is scrolling?
If it is a steady, once-per-second beep, it is probably your RAID controller. Does the system boot to Windows/OS ok? If so, use (or install) OpenManage Server Administrator (Managed Node from Dell's Support Site) to check the Hardware Logs and check the RAID array (under Storage/Virtual Disks). If it is not booting to the OS, then go into CTRL-M to see what the status of your array is.
Besides standard beeps codes indicating Processor, CPU, Memory or Systemboard failures,
Dell PERC (PowerEdge Expandable Raid Controller) or SAS Controllers (Serial Attached SCSI) generate beeps to alert failures on the RAID sub-system.
From your description of the issues (when the beeps start), i suggest you check PERC or SAS setup. If you have Dell OpenManage Server Administrator installed, you can log-in and check for more information. Additionally, on the next reboot check the PERC/SAS/CERC boot up for any messages. You may also access the PERC (Ctrl+M), SAS (Ctrl+R) CERC (Ctrl+A) Management Menu for specific failures and attempt a rebuild (assuming you have a redundant RAID Volume).
You can also speak with Dell Support and raise a warranty call if the system has warranty.
Note: PowerEdge 840 would ship with PERC or SAS Controller. PowerEdge 700 will ship with PERC or CERC.
This problem is due to the mix of registered and unregistered DIMMs.
64Mb and 128 Mb DIMM's are unregistered memory technology 256MB is
registered memory technology. A mix of registered and unregistered
memory prevents the server from completing startup, and results in an
error beep sequence and a blank screen..Use registered memory and it will be fine..