Beeps: deda, deda, deda, and RED led on motherboard flashes along with beeping. Sopmetimes happens if tower moved slightly, or may do so if left in idle mode, shuts down and starts the beeping. Pierre

That indicates a parity error on your memory modules on the motherboard. Try removing and putting the memory back in different slots. This usually fixes it. If it doesn't, then replace the memory.

The instructions below are copied from the programming instructions (page 11):

ERASE ALL PROGRAMMING
(The "out of box" factory default will be restored)
1. At the back of the lock, remove the screw at the bottom of
the lock housing and remove the cover.
2. Take out the battery pack and remove battery power by disconnecting
the battery pack.
3. Plug in the (provided) male shunt connector into the yellow
wire female connector.
4. With shunt connector connected, re-connect the battery
pack. The lock will immediately sound 3 short beeps (if
these 3 beeps are not heard, then restart at step 2).
5. The lock will then sound more slow beeps, 1 beep for every
second it takes to clear the memory.
6. After a few more seconds, the LED will slowly alternate between
flashing red and green--disconnect the yellow wire
shunt connector.
7. The LED will continue to slowly flash green and red for 25
seconds. To enroll Function Cards, proceed immediately
as follows:
• With the lock LED slowly alternating between flashing
red and green, present the Function Card #1
to the lock. The lock will sound 5 slow beeps.
• The lock LED will flash green rapidly. The lock is
ready to enroll the Function Cards.
• Re-present Function Card #1 to the lock. The
lock LED will flash green then red, with two beeps
(indicating the card was enrolled successfully).
• Present Function Card #2 to the lock. Again, the
lock LED will flash green then red, with two beeps.
• Continue to present, in order, Function Cards 3-
9. Each time a new Function Card is presented, the
lock LED will flash green then red, with two beeps.
After the 9th Function card is presented, the lock LED will flash
green twice, sound two beeps, and will then remain silent,
ready for use. Note: If the lock continues to beep after presenting
the 9th Function Card, check to verify that the yellow
wire shunt is disconnected.
Note: If you only wish to use the first 3 Function Cards, simply
allow the lock to "time out" after 30 seconds.

Here is the link to the complete instructions, in PDF form. You will need Adobe Acrobat or equivalent to view them:

http://napcosecurity.com/download/PL3000_WI1280A.04_PROG.pdf

Good luck-and please provide feedback if this helps!

The RAM in the motherboard is not seated properly, it might have slightly moved out of the slot or the physical contacts is not proper.It can happen while moving the cpu or may be due to any other shocks. Open the CPU tower. Remove the RAM and place it back in the same slot after dusting the slot. It will work for sure 100%
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As said, if it beeps 9 times after stopping, than this is known issue and if your bumper moves freely, you might be facing a sensor fault caused by poor quality of components.
Here is a guide to fix it

Have fun
Avi

Hi:
Check and see if somehow your video card came unseated from the motherboard. sometimes just moving a tower around can pop them loose.

anti theft. while the lights are flashing, hit the horn button twice.

The POWER LED on the front of the tower should be solid Green, If Solid Amber or Flashing Amber, there is either a power or MB problem. On the back of the tower are 4 LEDs the when posting normally are all Green. If YYGG for example, then you have a memory failure. More information can be found at support.dell.com using the no post troubleshooter

Tell me exactly what happens. LED colors, how many beeps, how long it takes.

dependent on how many beeps you hear is dependent on what might be the problem. A fuller explanation from pushing the power button to nothing happening would be more than helpful. Beeps in a Poweredge can mean motherboard, memory or as you said power supply problems.

• Bad video card - 1 long and 2 short beeps
• Bad power supply - 1) continuous beeps, 2) non-stop short beeps
• Bad memory - 3 short beeps
• Bad Motherboard - 1 long and 1 short beep
• Disk drive related problem / Video card problem - 1 short beep then nothing happens