No startup tone on upgraded G4

Before I roll up my sleeves and start disciplined troubleshooting I wanted to touch base with you in case you can point me directly to the problem, or close to the most likely cause.
I have a Gigabit Dual 500 G4 that I upgraded with a Gigadesigns M7D-1313G Dual 1.3Ghz in October 2004. The machine was also updated with a SATA adapter and added another internal drive at that time. It has been running 24/7 since then without problem (its run 24/7 most of its life). I added a Radeon 9800 PRO graphics card in Feb 2005.
The machine is used for day to day activity as well as a printer and Retrospect backup server for 5 other machines, small duty. On two occasions over the past couple of weeks I found the machine with a black screen and unresponsive state, pressing the restart button brought it back.
Yesterday the restart did not bring it back, and there is no startup tone. The drives spool up, fans run and there is a Radeon Graphic in the center of the screen with a red flashing bus connector. I have not added any hardware or updated software in months. There is very little dust internally and the machine its located in an unheated room. The exhaust is warm but not hot.
I reset the PDU and tested the battery. There is 1.5 Gbit of RAM scattered over three chips that are a little older than the CPU upgrade. I needed to replace them for one of the OS10 updates.
On one occasion 6 months ago I ran into the same problem, but it eventually clear up on its own.
Similar problems on my laptop in the past led me to the CPU.
G4 500 DP, Wallstreet G3 300    

Hi, Yositimy -
Testing a battery is tricky in that it's easy to get a false indication of its health - to get a reasonably valid reading, it should be tested while under load. That machine is old enough now that its battery should be replaced if that has never been done, even if testing it seems to indicate it is okay.
...there is a Radeon Graphic in the center of the screen with a red flashing bus connector.
That could indicate there is an issue with the graphics card. Try reseating the graphics card in its slot, and reseating the connectors on the monitor's video cable - while doing that, check the connectors for bent pins.

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