Does anyone know a good Linux live image for diagnosing systems?
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Adding on to other suggestions, if you're not aware of Ventoy it's a very handy tool. Using it you can have a USB drive with several live images on it which you can choose at boot time. Great for quick testing, just drop an ISO in a folder!
Unfortunately I believe the usb has to be created from Windows…
What makes you think that? Their website has instructions for installation via a Linux box. https://www.ventoy.net/en/doc_start.html