Three beeps then led flashes and fan is on

Hi. I haven't used my mac in a while and tried turning it on...it beeped three times then the led flashes three times and pauses, and the fan goes on full blast. I found out in my quest for answers that the 3 flashes could mean bad RAM. I have the factory installed RAM...I had some problem with my computer before and an apple tech put in a new logic board. Could this be the problem? I'd like to fix it myself since the tech is a hike away. Any thoughts? Thanks for the help.
PowerMac G5 2ghz   Mac OS X (10.4.8)  

Hi. Well -
Not sure whether you need the FW card for your recording session - but if you remove the FW card, and get the G5 up and stable first - then put back what you need and try it.
I would try to boot from the most recent system disc you have - presumably it came with 10.4 if you have a "Late 2005" dual-core 2GHz G5 with PCI-Express
http://support.apple.com/specs/powermac/PowerMac_G5_Late2005.html
- and Verify, or Repair if necessary, the startup disc
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1018.html
in case directory corruption has occurred during the various shutdowns and restarts.
If boot problems still persist, it may be worth re-seating the video card, also.
There are threads in the Forum mentioning that FW card
http://discussions.apple.com/search.jspa?objID=c108&search=Go&q=siig+NN-E20012-S 2
There is some discussion there of the power requirements of the connected firewire device - and of the possible need for a separate power connection to the card. It's also possible that the FW card needed re-seating, after the G5 not being used for a while.
It may also help to disconnect anything firewire - iSight, drives, etc. - not needed at this pressing moment...
Have presumed that you don't need Airport for tonight - but if it appears to causing problems with the basic startup, it can be disconnected; although this is more complicated on a dual-core, and to be avoided, if possible.
Anyway - trust some of this helps. Good Luck.

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