Question Computer won’t boot

Jan 25, 2020
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Hey peeps. Glad to be hear.

So I booted my new build up for the first time. Everything went well. Set the bios up, saved and continued. Got a black screen with an underscore so I turned the power off. Computer won’t boot. No lights, fans etc. Thinking I’ve fried the psu or motherboard I took it to a shop. They hooked up a different psu and boom! Computer boots. So I buy a new psu. Got it home, connected everything and I’m sure it’s everything. 24 pin, 8 pin, pci-e, SATA and nothing. What could the issue be? The house sockets? I’ve tried them all haha.