IMac G5: No signal due to software problems

We have a wireless network at home from an Alcatel SpeedTouch router connected to the internet. It has been providing good internet services to an iMac G5, an iBook G4 and now an iMac Intel, but since last two months or so the iMac G5 has been experiencing low signal levels and drops of connection which finally made even impossible to download a single e-mail. At present it only detects our home network from time to time and establishes connection very rarely. Slight improvement was achieved when MacOs was updated to 10.4.8 but things are now even worse than before.
Now I'm making serveral holes through my home walls to phisically link my wireless router to my iMac G5 with Airport Extreme... My other computers (iBook G4 and iMac Intel) still work fine with Airport and perfectly connect to the router...
I have interchanged Airport cards from iBook to iMac G5 and realised that the problem is not with the card (both cards offered excellent signal levels inside the iBook, and poor or cero levels in the G5). So its a software issue, which starts appearing on the forums as it did the problem with Airport Base Stations (AEBS) a few weeks ago... That problem was apparently solved downgrading AEBS firmware to version 5.5.1 but for iMacs I don't see any solutions yet.
I have done some "reset-nvram" and "reset-all" (a suggestion I found on other forums), and I have had the computer unplugued from the power wires for two days (in order to reset the iMac power unit), and nothing seems to solve anything...
Finally, I posted a few messages here and there, looking for help.
Many thanks in advance for reading this. Any ideas will be welcome. Thank you again.

Good news so far. I talked with an Apple tech this morning and we trouble shot a few things. Two good suggestions were made by him and so far one or both are working. 1. Removed apps not needed in 'start up items' in sys preferences. 2. Unchecked 'put hard drive to sleep when possible' in sleep prefs. So far today waking the computer about 10 times has not caused the wake problem. Tomorrow I will check the 'put hard drive to sleep...' and see if that causes it. If not, I will post again and let everyone know.

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    Crash Reports for the Last 3 Days
    All Crash Reports
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    Enabled: true
    ID: [email protected]
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    Device ID: 0x6758
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    Experimental Features
    ---------------------

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