Cat 5e home network wiring issue

CONFUSED

Home is wired with CAT5e.
Installing a wired home network

First computer works fine through the router.
Can’t get internet on the second computer in a different room on a different cable. Says a network cable is unplugged.

Test the cable and get continuity on all 8 wires. If I take the laptop to the basement where the router is and connect it with a patch cable to the router, it gets internet.

If I connect the cable I am haveing trouble with directly to the DSL modem (no router)and the computer, it works fine(I get internet).

So it seems this wire will work when connected directly to the modem, but run it through the router and it won’t work, but the router will work with multiple computers when using a patch cable.