My mac pro keeps chimming when starting up my Mac Pro.

Question

Over the weekend my Mac Pro has frozen several times.  Now after the last time it froze, when I try to turn on my computer the monitor remains black and my computer keeps chiming every couple seconds.  Almost like it is trying to start up but keeps resetting itself.  I have tried starting up in safe mode but it does not work.
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Answer 1

pull your drives
Reset SMC
http://www.apple.com/support/macpro
first you need to stop the hard crash on startup
While uising jorunaling should help, in some cases it isn't enough to just restart, you need to do check/repiar and safe boots as well as boot from backup clones. Each new release of OS X gets a little better. But if it happens a 2nd time:
hardware error - RAM, bad sectors, power supply, wall current (no electric heater on same circuit), bad USB cables etc etc
software - harder to say but corrupt files, drivers, cache, fonts, or corrupt cache files and folders
.... and that isn't a list but in general, there are faq for kernel panics, their cause and trial and error to resolve
depending on when and what OS it came with and any graphic card changes the OEM DVD may not work but 10.6.3 DVD would. But best is to already have bootable backups and emergency boot drive or partition.
Don't just keep working even if you think you must or safe to - take some action and help prevent it from happening again and picking up the pieces too.
Too often too many people come and post here thinking this is a notebook forum with notebook type related issues, it is not. I try to wed, redirect, relocate and wish there was a sign up front for check ins.