I’ve only skimmed through this thread, so might have missed something. If different phone works fine on this PC with same cable and PC’s USB port, it looks like an issue on phone’s end. Either a broken phone’s USB port (rare for USB type C) or a software issue. Go to recovery (try ADB or MTP file transfer) and fastboot mode (try fastboot tool) and check whether it will work there (that might help rule out software problem).
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