Tone at power up, then to the "mac-boot" prompt

I inherited this G5 2ghz 20 from a friend who bought the newest 24", and I remember him having the problem I'm now experiencing. When I got it, I completely erased the drive and installed everything fresh, and did not see that problem for 6 months that I've had it.
The last time I powered up, there was a loud tone, then it went straight to command line mode which stated, to continue, type mac-boot. I did that and it booted fine.
Could this be the precursor to something undesirable?

Try running Rember to check for faulty RAM.

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