Hello everyone! First time poster here. So, we all know the G4 MDDs are very nice machines, but they do have a slight noise problem. So much in fact, that I find the machine quite hopeless to use (I hate noisy computers...), unless of course you have a well-ventilated, sound-proof room to keep the machine in, well away from your desk... I've been thinking about solutions for making my MDD quieter and I thought I'd share my project here for anyone interested. I've decided to replace the shady and noisy MDD Power Supply with an ATX Power Supply. I considered several options, like installing a Micro-ATX PSU, modding the MDD PSU with ATX internals etc... However, I find Micro-ATX PSUs to be slightly more expensive than normal ATX ones and they often do not provide a sufficient amount of power, and I do not have the tools needed for replacing the MDD PSU internals with the ones from an ATX PSU. And so, I decided on a normal ATX PSU, which then leads me to the problem on where to install it. I've seen solutions for mounting it in the "ceiling" of the case, but I don't really like that solution since the PSU might be in the way if you have a long expansion card installed. It also creates quite a cable-mess due to a lack of space. After considering other options I finally decided to install it in place of the optical drive bay. I reckon I can live without an optical drive, and since the Superdrive in my MDD is failing anyway (can't burn a DVD properly, can't read CDs...), it's not much of a loss in my opinion. So I bought an Antec Earthwatts Power Supply, an ATX extension cable, some shrink tubing and some cable-ties. The Power Supply is rated at 430 Watts which is a tad more than the original MDD Power Supply, and since no power will be dedicated to the ADC system I reckon it might even be slightly overkill. So, here are a few pictures from the project so far: Where I'm going to install it. I still need to remove the small brackets that keep the would-be optical bay in place. How it's going to look. I can use the MDD PSU securing brackets (marked with red) for fastening the cables with cable-ties. I'm probably gonna fasten the PSU using velcro. The stock case fan has been replaced with a Noctua fan. Should provide a decent enough airflow while keeping things nice and quiet. Another pic of how it's going to look. I know the PSU exhaust fan is going to blow slightly on the CPU heatsink, but I don't believe it is going to be a problem. The Power supply I'm using should run relatively cool anyway. Attached a cable-tie to the back of the PSU to route the wires upwards. Tomorrow's work. Gotta be careful doing this... solering a wire incorectly could fry the whole thing.