Sleep Light

So I recently started noticing that the sleep light on the front of my powerbook will start to turn on and do it's 'sleep blink' after about 5 minutes of me using my laptop. The system does NOT shut down or go into sleep mode, it simply just blinks for no reason at all. After an hour or so of my powerbook being left on at the office, it will turn off for about half an hour, then start all over again. I have since not had any problems with my powerbook actually going into sleep mode or any related startup/shutdown difficulties. I checked the system logs and I get the following:
Jan 30 17:56:03 localhost kernel: AppleADT746x::doI2CRead cannot read from I2C!!
Jan 30 17:56:08 localhost kernel: iled, retrying...
The above continues for a long stretch of the system log.
Any ideas boys and girls? Thanks!
-Steve

ok well i got the powerbook back after dhl managed to deliver it incorrectly to the wrong house on the other side of town.
Here is the verdict:
Exactly as it says on the repair page:
Product serviced by replacing the following:
630-4721 PCBA,MLB 1.25GHZ,PB15"
did some googling and this is what i found
PCBA=printed circuit board assembly.
MLB= Main Logic Board.
here is a forum topic that talks about it more.
http://forums.macosxhints.com/archive/index.php/t-45841.html
from what it looks like in the repair it was a huge repair i can actually see that they replaced all the main-board components at least on the right side with new ports and everything, but it has fixed the problem i still believe that it was caused by a software update.
Dual 1.25 PowerMac G4 mdd, G5 1.8, Powerbook 1.25   Mac OS X (10.4.6)  
Dual 1.25 PowerMac G4 mdd, G5 1.8, Powerbook 1.25   Mac OS X (10.4.6)  

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