IMac G5 PowerPC won't start - any ideas?

My iMac G5 PowerPC won't start - the initial chime will sound, but nothing appears on the screen. After about 10 seconds the fan starts to run at a very high speed. The "on" light does not come on. To shut it down I hold control, open-apple, and press the start button.
Obviously, I am going to have to take it somewhere for a repair estimate but I would like to have some idea of what may be wrong.
Does anyone have any ideas?
Thanks.

Before we become too gloomy, first try re-setting the SMU. Very simple procedure. The chime is a bit of good news, but this could be the power supply, the logic board or both.
http://support.apple.com/kb/HT1767?viewlocale=en_US
If this is a non-iSight model, you can take the back off (three captive screws at bottom; don't unscrew them too far, just enough to get the back loose.) Very easy to do. Then follow this procedure to see what the LED lights are saying about what might be wrong.
http://support.apple.com/kb/ht2173
Also, look for swollen, or leaking capacitors on the board. They are numerous, little metal cans about 3/4 inch tall. Inspect for perfectly flat, not rounded, tops.

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com.apple.message.domain: com.apple.calendar.store.inconsistency
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com.apple.message.signature: Other CalDAV
com.apple.message.signature2: etag (ctag)
com.apple.message.summarize: YES
23/06/2013 00:32:27.116 CalendarAgent[195]:
com.apple.message.domain: com.apple.calendar.store.inconsistency
com.apple.message.signature: Other CalDAV
com.apple.message.signature2: etag (ctag)
com.apple.message.summarize: YES
23/06/2013 00:32:27.116 CalendarAgent[195]:
com.apple.message.domain: com.apple.calendar.store.inconsistency
com.apple.message.signature: Other CalDAV
com.apple.message.signature2: etag (ctag)
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23/06/2013 00:32:27.116 CalendarAgent[195]:
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IMac G5 (PowerPC) won't turn on

Hi there,
My old iMac G5 (PowerPC) won't turn on. Its been having problems for about a month where it would randomly turn off (not shut down, but completely turn off). It would also take about 3 or 4 tries before it would start up. Now I can't even get the computer to turn on at all.
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