Xbox series X No Signal

The sticky white residue you talk about could be the issue. Isopropyl alcohol and a toothbrush would be my first step. Put some in a container and dip the brush in and give it a scrub. The alcohol doesn't affect electronics so it's fine. If you don't want to buy any ask a reputable mobile phone or computer shop to give it a good clean. Shouldn't be expensive. If it still doesn't work and the port is fine it could be the retimer chip has gone. Any decent shop should be able to remove and solder a new one on unless your comfortable with hot air smd work yourself. I did my xbox one s but I've soldered for years.