What does it mean when I try to start my old iMac and I get a beep beep beep that sounds like a truck backing up?

I have an iMac that was running Lion, and everything just died. I tried to wipe the hard drive and reinstall the operating system, but now when I boot I get a beep beep beep that sounds like a truck backing up. What is wrong?

How many beeps?
1 tone, repeating every 5 seconds: This indicates no RAM is installed.
3 successive tones, a 5 second pause (repeating): This indicates RAM does not pass a data integrity check.
1 long tone while holding down the power button: Indicates an EFI ROM update is in progress on a computer manufactured before 2012.
3 long tones, 3 short tones, 3 long tones: Indicates EFI ROM corruption is detected and the computer is in EFI ROM recovery mode.

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