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The HP AIO PCs' hardware is not exactly the same as a regular desktop's. You are dealing with two different form factors for computers, with desktops being the most common and most customizable option whilst AIO are specially-designed for common consumers and are not meant to be customized by the average user. As such, only some of the parts of the AIO are able to be salvaged for use within a desktop: the hard drive and optical drive are almost certainly able to be saved; the power supply may possibly able to be saved; the motherboard, RAM, CPU, and GPU are unlikely (or not worthwhile) to be saved. In addition, it is highly unlikely that any of the parts from your Antec PC would fit into the HP AIOs. AIOs are not standard, and working inside of one should require a user of strong familiarity with computer hardware. If all you're going to save is about $70 worth of hardware from the AIO, you might as well keep the AIO together and just save up $70 for new ones in a new desktop.You can salvage parts, but you will need to buy parts, since those are all in one desktops which are basically laptops with a desktop design.