Not sure, but if a cooling fan starts when you switch it on, maybe PSU is okay. I would check if there is any missing power cable connection to CPU or GPU or anything. If assembled correctly with all the components and cables properly in place, it should start. Good luck with your PC!
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We've since determined that it's most likely the power supply; we don't have a spare to test it though, but it doesn't seem to be drawing enough power to activate the vga and half the time it won't power on with the sata-connected cooling. So I'm arranging for a return and replacement and hopefully that's it. 🙁
I see. In that case, PSU could be the problem. Let's hope it's not the motherboard.
And if it is the motherboard, here's hoping it didn't kill everything else during this trial and error. 😅😅😅😅
What you just said reminded me of my PC building history. Faulty motherboard was the worst. Let's hope that's not the case! haha
Annnndddddd... it was both the PSU and the motherboard. 😅 Such bad luck!!!! But thankfully the dead motherboard hasn't seemed to have fried anything else. Tested my graphics card and RAM and everything in my partner's computer and it all works. So, now to get a replacement motherboard instead! Ugh! Computers!! Haha.
Actually I think you're lucky. Imagine a faulty motherboard with fully functional PSU. In the worst case, it can be a chancellor Palpatine. Your motherboard had no way to do any harm without power. Anyway, glad to hear everything is on track!