This computer is old (15 years). It is slow and outdated.
You do not want this computer to be your daily mainstream workstation.
This really is a niche application computer at this point, like a Home Media Server.
I removed and eWasted the HDD.
Otherwise it was functional just days ago (other than being really slow/outdated for modern OS).
You will need:
1. 2.5-inch SATA hard drive
2. 65W (19.5V, 3.34A) AC Adapter
Dell Service Number G77YPM1 so you can lookup the specs yourself
https://www.dell.com/support/product-details/en-us/servicetag/0-NHlDZzhqQkpYeW9WUXZ6Zlh5N1VyUT090/overview
Came with Windows 7, it was running Windows 10.
CD/DVD Drive, ethernet port (no wifi built in), HDMI, DVI, S/P DIF Audio, 1394 port, 3 rear USB. 2 Front USB, locking port.