FWIW - I did this with my last system. I ended up with enough good parts to build a nice second system!
Anywhoo - have you checked your Event Viewer? The lack of errors there will help to confirm this as an issue that's outside of Windows.
Have you checked your BIOS settings? Tried resetting them to default/safe? Checked to ensure that large hard drive support is enabled?
Where does the reboot occur? While the system is still POSTing? After Windows Starts to load? Somewhere else?
About all that's left is the vid card, keyboard, mouse, and any other peripherals you may have connected.
Try physically disconnecting everything but the PSU, CPU, mobo, boot drive, Video card, monitor, RAM, Keyboard, and mouse.
You can presume that the mobo, PSU, and RAM are good (since they're new) - that leaves the other components as suspect. The keyboard and mouse are the easiest to check - just borrow them from another machine for a few minutes. Then that leaves you with the CPU, boot drive, and video card. I haven't heard of that many CPU's just flat going bad. A new boot drive will cost a bit, and will have to have the OS installed on it. So, that leaves the vid card as the next replacement attempt.
You can try and borrow an older vid card - or you can buy a cheap one from a major retailer like BestBuy (but ensure that you can return it if needed).
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