Includes the following:McIntosh MS750 with an internal 300 GB hard drive taken from a used MS300The original (nonfunctional) 750 GB IDE hard driveA spare 500 GB SATA hard drive (used) that was cloned from the 300 GB MS300 hard drive using "HDD Raw Copy Tool 1.20" (I can also provide the 300 GB raw image of the drive via a file sharing service if needed)This MS750 originally would not fully power up (blinking standby light) due to a dead internal hard drive. The drive was swapped with one from an MS300 with a dead motherboard, and the unit now powers up and appears to be operating reliably with the exception of the CD database, software update, and registration network features (this may be due to the services being discontinued; I cannot confirm this for certain). Automatic discovery of internet radio stations does not work, but stations added manually do play back. The unit will ask you to go through the registration process every time it is brought out of standby, which takes about 20 seconds to skip through. I am not aware of a way to disable this registration check.Please note that no service work has been done to this unit beyond replacing the dead drive with a used one from an MS300 and cleaning out the dust. The IDE CD-R/RW drive (Sony CRX230EE) is original but was able to play back a CD without skipping for several hours straight (CD burning functionality was not tested). There are no visual signs of damage to the motherboard or power supply boards, but several 10 uF surface mount electrolytic capacitors on the motherboard have a slight bulge on top and may need replacement in the future.You may want to replace the internal hard drive with a new one due to its age. I have read online that people have had success installing a modern SATA solid state drive (SSD) by using a StarTech IDE to SATA adapter, but I have not tested this myself. To my knowledge, the operating system would have originally been installed on a new hard drive by inserting a special "golden CD"; I do not have this CD and was unable to find a disc image online, however you can get around this by doing a "byte-for-byte clone" of the original hard drive to your new one (I used a program called "HDD Raw Copy Tool 1.20"; you will need two USB to SATA/IDE adapters in order to do this, or a desktop PC with extra ports. The original drive uses a proprietary filesystem, so some backup/cloning utilities may not recognize it).Cosmetically, the unit is in fair condition. There are a few dings on the top black aluminum rail and right black aluminum side panel. The top and left/right black aluminum side panels have some scratches. Left silver aluminum endcap has several noticeable scratches. Right silver aluminum endcap has a few very minor scratches.Test summary:All front panel buttons workingRedbook audio CD playback working, as well as playback from the hard drive. No skipping during several hours of continuous playback. CD-R burning functionality was not testedAnalog and digital (both coaxial and optical) audio outputs workingAnalog input pair 3 working (analog inputs 1 and 2, and all digital inputs appear to only be selectable with the original remote while in the recording menu; I do not have the remote, so they are untested)Analog video outputs working (composite, S-Video, and component)Ethernet port working (unit is controllable via built-in web server; CD database service not working, unit registration service not working, software update service not working, cannot automatically discover internet radio stations, but internet radio stations that are manually added do work)RS232 ports, PWR CTRL IN, DATA IN, S-LINK ports, and the remote control sensor are untested. I attempted to test RS232 functionality but the unit did not appear to respond to any of several different commands I sent it. This was based on two different command sets that I have seen other McIntosh units use in the past. It is possible that I simply did not send the correct command, or that RS232 functionality was disabled inside a menu only accessible with the remotePower supply board measurements (taken while playing music): +3.394 V, +5.119 V, and +11.892 V measured at the 3.3 V, 5 V, and 12 V supply pinsSoftware and firmware versions shown in the last imageIf you have any questions or would like additional photos, please feel free to send me a message.