I've had a look and there's a program called DBAN that'll suck the life out of my lap top but i don't have the install disk to put Windows back on as I had it built by Cyberpower and they sent to me ready to go.
If I list it without an OS will it devalue it much? I'm assuming whoever buys it will probably just strip it for bits anyway as i was going to sell it as "for parts not working" due to the battery being shot and my daughter having picked 2 of the keys off!!
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PS: If you're using the laptop for music stuff, ignore Windows 10 build 1903. Very bad DPC latency spikes with this one.
If you don't have original install media then on most mainstream laptops there will be a recovery set creation tool built-in. Generate that, then do a factory reset.
If you're totally paranoid, make the media, then use DBAN (it'll take "some time") and then reinstall from the media you created.