IMac DV slot-loading power button glows orange after shutdown, cant start

Hi,
I have iMac DV SE (graphite model) of 1999, 320MB RAM, 40 GB HD, running Mac OS X 10.4.7.
Everything seems to work fine, but when I go to Shutdown, it shuts down fine and power light goes off...Then several minutes later, the power button turns orange and stays like that for a few hours and then goes off again.... Then several hours later or the next day, I have a hard time getting it to turn on again by hitting the power button.. the keyboard (old iMac keyboard) power button never works to turn on the iMac (should it?) but when I hit it while in Mac OS X, it shows me the menu to shutdown, restart, sleep, etc...
Also, by PRAM battery seems good (I measured it at 3.6 V) and it seems to keep track of the date and time just fine, so I cant imagine it's the battery....
So in the past when this happens, it just keep hitting the power button and/or remove the power cord and re-insert, etc, and some combination of that after many tries the iMac finally starts up...
Any idea what's going on? I cant find any discussion of the power button going orange after a shutdown and the fact that my keyboard power button doesnt work to turn on the Mac...
Help...
Andrew

Ah.. very interesting... I'm surprised I couldnt find any info on the 'net about this orange power light...
Anyways, I found have some interesting stuff since...
1. On this last occasion when it didnt turn on, I was jiggling some stuff (plugging and unplugging the power cord several times.... then I tilted the iMac slightly and let it "drop" to jostle/jiggle it)... and after the slight "drop," I hit the power button and it turned on just fine... d'oh... I wonder if something's just "loose" somehow... I dont have a random shutdown problem, once it's turned on and inside Mac OS X, it works fine for hours and hours until I tell it to shutdown. hehehe...
2. Just last night, before going to bed, I shut it down and since it's plugged into a power surge, I turned the power OFF to the power surge, so now it doesnt have any power to it... so this morning, I turned power to the power surge, and hit the power button on the Mac and it turned on just fine! d'oh again.. hehe... so it almost leads me to believe somehow that leaving the power cord with electricity flowing to the Mac when the Mac is shutdown is "hurting" it somehow, and if there is no power connected when it's shutdown, it works normally (I think)...
Very strange indeed...
Anyways, I got this Mac second hand so I am wondering if this was a problem for the original owner... when I first got it , I knew the hard drive was missing, so I put a 40GB IDE hard drive from a PC and formatted it, etc... so not sure if the hard drive could cause a boot issue...
Oh, well, I guess I'll keep using this iMac until it no longer turns on.. lets see how long I can keep going like this ..heheh..
Andrew

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