I have a dell power edge 2300 and at boot there is a constant beeping and wont stop until i turn the server off wht could this be

To power off using the power button, press and hold in for more than four seconds.

However this is not solving your problem of not booting, needs some more information. Such as Beeping noises, number and length of beeps. Or any LED.s flashing?

I had the same problem in two Power Edge 2970s. I had a bad stick of RAM in each server. After removing the bad sticks they both successfully posted.

If you're positive the memory is good then it means that the system board or the actual seating for the memory is damaged.
If you have someone with soldering skills they could try and re-flow the seating for the memory. Otherwise you simply just will have to replace the system board.
info about this process can be found HERE.

replace ur hdd

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.

It probably is trying to tell you that it is overheating.
Check that the fan(s) on top of the CPU(s) is/are working.

Sounds like the RAID controller has failed. I would replace this first as RAID controllers are less expensive than replacing the system board, or the server as a whole.

Suggested: PERC 5i (RAID 0/1/5) or PERC 5iR (RAID 1 or 0 only)

Power supply, system board, or keyboard problem

Dear jckim, Which server you are using? Usually this error occurs when raid controller card have some problem.Have you getting any error codes?

It is just keypad problem.needs servicing the keys.