Anything worth keeping?

I bought a pre-built system from Limetech back in 2007, the Lian-Li PC-A16 case with 15 hot-swap bays in the front. The system has been in storage for roughly the past 3 years through a move, and today when I decided to get it out and power it up I ran into some issues. Maybe power supply, I'm not certain. After being on for about an hour working on a parity check it just abruptly shut off. Now it generally will not power on at all, though it may come on for a few seconds before shutting down again - sometimes basically immediately, sometimes getting all the way to the USB's unraid boot menu before shutting off again.

Given the age of the system, it's probably worth rebuilding rather than just fixing whatever this isolated issue may be. But is anything worth saving? The case and SATA drive bays? I have experience building PCs, but nothing quite like this. And life has happened so it's been a good while since I've built anything and I'm not up to speed on current hardware trends. I'm attaching the "system" folder from an old diagnostics run on the USB, since I can't access the live system to pull info about the hardware. It looks like two Promise PDC40718 PCI cards provided four SATA ports each - those are probably worth replacing with something modern - and the motherboard provided the other 7. There's nothing else particularly special about the system. I only ever really used it for media storage. I'll probably want to run Plex or some DLNA server docker once I get it running again, primarily for local use.

TIA for any input!

system.zip