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There should at least be a message on the monitor indicating there is no
signal coming to the monitor. The first thought that comes to mind if
all is connected would be that the power supply has failed. And maybe the graphic card.
Call also the DELL support in your country they will be glad to help and they probably know the fault.
The sound may be an indicator alert. overheating, unlocked latch, etc. If the system is running ok and no noticable problems with your software, check your BIOS setting for log information related to alerts. If you find nothing of significate problems, you can disable alerts in the BIOS.
Check the PowerEdge Raid Controller for parity problems. Sounds like the status on the physical volumes participating in a RAID array has been degraded.
Loud beeping from a drive is usually an indication that an invalid drive array member has resulted in a degraded logical volume.
If you were counting correctly, you had at least three drives - most likely participating in a RAID-5 setup. The array might have been rebuilt with one bad drive. But it sounds like you've got two corrupt physical volumes in the array. And that's not good.
Write down the exact number of beeps and how long they last to find what the error means. The are call BIOS post codes and they resemble Morse Code. (ie. one long, 3 short, 2 long = RAM issue) Good luck!!
Disconnect from the network and all other accessories, and power up the system, this might be due to a faulty device attached to the system, eg: when you connect a usb faulty device the boot takes very long time, sometime it does not boot up.