my linksys velop mx5300 light is solid red, no internet at all, what do i do?

Your parent node isn't getting an internet signal from your modem. That's what the solid red light means.

1. Check the cable connecting the Velop's yellow Internet port to your modem. Unplug and firmly reseat it at both ends.
2. Power cycle your modem: unplug it from power for 30 seconds, then plug it back in. Wait for all its lights to stabilize.
3. Power cycle your Velop node: turn its power switch off, wait 10 seconds, then turn it back on. Wait for the light to go through its startup sequence.

If that didn't work, try a different Ethernet cable. Use a CAT5e or higher-rated cable. Also, plug the cable into a different port on your modem if available.

If the light stays solid red after all that, the issue is likely with your modem or your Internet Service Provider. Contact them for further troubleshooting.