I've an Asus P4P 800 that I had to partially recap a little over a year ago. I got it for free in 2019 and have used it to play some games. I looked at it one day, and it had a bulging cap so I replaced all that were that brand/voltage.

KZG are known to fail in storage. Had several cases of it.

A friend from work messaged me, he found an old pc in a thrift shop, figured I might like it and brought it home for me.
This was the picture he sent me:

Imagine my joy.

So in the last few days I took the machine apart, cleaned it and checked for visible damage.
Today I've started reassembling. Happy moment: we have output!

This makes perfect sense, since only the 3 1/2"drive and the screen are attached. All other parts, including hard drive and memory cards, are not connected.
If you want, I can post updates on the reassembly every now and then. Also open for suggestions on what to use it for.

dr_st wrote on Today, 05:54:

Looks like the GPU (Zotac GTX 660) is finally toast. It won't POST in two different boards. Even prior to that, BSODs pointing to the nVidia driver were getting far too common.
Currently using a GT 710 just a a placeholder until I can get a proper GPU.

Found a GV-N950XTREME-2GD. Seems to work fine. ~30% more performance for ~40% less power is a pleasant tradeoff. No idea why it uses an 8-pin PCIe power whereas the 660 used a 6-pin. It's also a bit bigger and heavier, but not unreasonably so.

aspiringnobody wrote on Today, 16:08:

Lostdotfish wrote on Today, 14:55:

All the 6.3v 1500uf caps were totally gone... I removed the 16v ones too as they were the same Chemi-Con KZG series. Now I need to dig out my polymer caps and see if I have the right ones to replace these with...

That’s fairly alarming, that’s a late 2003 board, I usually consider that to be after the capacitor plague.

I wonder if this board got hot at some point in storage?

All KZG and KZJ are bad. In my experience especially the 6.3v version. 16v and very late ones (2008+) are maybe less bad but still dodgy.
Their replacement was the KZE and those are reliable.

If nowadays you need caps with such extremely low ESR as KZG were used back then go with polys without a doubt.