Hello everyone! Well, just received my G5 Quad yesterday! I have a couple of issues with it, and thank God the cooling system is fully functional. The original owner told me that he replaced the power supply, as the serial number fell in line with some of the Quad models needing replacement power supplies. Good news for me: The seller took care of this a while back. Now, here is something really weird. I am not getting the Yellow trickle light to come on when I remove the air deflector shield. I wonder if this has to do with the new power supply Apple put in this thing? I tried a SMU reset and PRAM reset to no avail. Apple Service Diagnostic and Apple Hardware Test report everything normal and running normal with regards to my logic board, and processors. I even re-calibrated the processors just to ease my concern of coolant leaks; the calibration test passed with flying colors - the Processors are fine and working normally. My current temps for the CPUs are as follows: CPU A Core 1 Diode: 120.4F CPU A Core 2 Diode: 120.0F CPU B Core 1 Diode: 125.9F CPU B Core 2 Diode: 124.8F I assume all this is normal.. Next issue has to do with noise. I think I have isolated the main noise coming from the Nvidia 7800 GT - I was told this is an extremely LOUD video card. I am pending an order for the 6600 256MB version which has just a black heatsink and no fan. Other than those problems above, the machine is running just fine.. I am just concerned as to why the Yellow Trickle LED isn't lighting up or coming on when I remove the air deflector shield. The only time the RED Stop light came up was when I was trying to boot up Apple Service Diagnostic OS Version.. I forget the page, but in the service manual, it states that Quad G5 is NOT compatible with 2.6.3 Operating system version of the Apple Service Diagnostic, where as Open Firmware is. Again, no other problems recorded.. Although, it came with 8GB of memory, I found two sticks to be bad and as a result my Quad now has 6GB as was stated on the invoice when I bought this from the seller. I hope someone can help or shed some light on why the Yellow Light is not coming on. Not that it doesn't bother me, its just not normal behavior. Thank you. Josh. Oh, I am pleased to mention to that my liquid cooling system is a Panasonic model and not Delphi(2 big black blocks in case no one remembered what it looked like).