Cable modem will only work when directly connected

I recently moved and got the Comcast cable box. I went out to buy a cable modem because my old one died. the new one works perfeclty except whenver I want to use the internet, I can't watch TV> I only have one cable in my room, I used a splitter so I could watch TV and go online. However, so far i've only been a ble to do it sepratly. I can only use the internet with my cable directly plugged into the cable box. for tv, it is unaffectred by the splitter. Could the splitter be too weak for both items? i have no idea how old it is so it could be I need a stronger one? it's really annoying!

Yeah, or a directional coupler. (This is what my cable install guy used - it is similar to a splitter but not quite the same.)
What you need depends a lot on what signal strength is available at your location. In mine it was strong enough to use a 10 dB directional coupler that dropped the TV signal down by 10 dB (receiver still works fine), but passed an almost full-strength signal to/from the modem.
However in some places, a 10 dB drop will make your receiver start losing signal.
*disclaimer* I am not now, nor have I ever been, an employee of Best Buy, Geek Squad, nor of any of their affiliate, parent, or subsidiary companies.

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Nano small battery indicator showed it was empty despite being fully charged
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Cable modem will only work when directly connected

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