How can you tell if your cable modem is defective?

My cable internet is always down.. Then I would have to go unplug my cable from my modem and turn it off and on for a while before the interent will work again.... Then the internet would only work for about 20 minutes or less, then it becomes down again.
My modem shows that it can receive, but it cannot send out. Does this mean it is defective or is it a problem with the actual cable wires or the cable company?

jay is on the right track. your isp can help diagnose if the problem is your cable modem. process of elimination can help here too if you know someone with a similar setup - borrow their modem and see if you are still having the issue.

Normally a cable needs to transmit and recieved data before it will go to work.. for Locking purposes on the cable provider. Call you local cable provider. someone might split the Cable and made you cable signal weak... And yes cable modem breaks also.. So its either one of them. Good luck

PS
Im guessing its the cable signal

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