Power Mac G5 will not power on

Ok a little background:
Bought this (June 2004, dual 2.0 ghz) from a friend. Was fully working at the time. I took apart the computer to clean all the parts, it was quite dusty after 4 years of service. Now when I put everything back together, it won't power up!
I was quite extensive in my disassembly (I took out logic board, PSU, HD cage, all fans), and made sure everything was back in order. I am quite experienced at working with computers, so I am not inclined to say it was my fault that I probably statically discharged any components or damaged it when disassembling (I have built and serviced many computers before).
I am guessing it is the PRAM battery that is at fault? I have read a dead battery will cause the machine to not power up at all, and it is after all a 4 year old computer, so battery life was probably reached, so could it be just a wierd coincidence that after I cleaned it out it failed to start? PSU doesn't seem to be broken because there are two clicks whenever I plug it in.
One thing I did notice was that when I took out the battery and plugged it in, the power LED blinks once quickly, but when I put the battery back in and plug it in, the power LED doesn't blink. That is the only indicator that there is some life in the system (are there other diagnostic LEDs in the logic board I am not aware of?). Resetting the PMU does not fix anything, nor is leaving the battery out for an extended amount of time.
Any ideas Mac Gurus?
Thanks!

RAM stores certain system and device settings in a location that Mac OS X can access quickly. Exactly which settings are stored in the computer's PRAM varies depending on the type of computer as well as the types of devices and drives connected to the computer. Parameter RAM is a small area of non-volatile RAM (NVRAM).
Some information stored in PRAM includes:
Display and video settings such as refresh rate, screen resolution, number of colors
Startup volume choice
Speaker volume
Recent kernel panic information, if any
DVD region setting
If you battery is bad this info is not available and your Mac will not start up>
Message was edited by: macbig

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