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I seem to be living in the movie "Groundhog Day". Every day this week we are faced with the same issue. To begin, the old DVR box was giving us a lot of trouble with playbacks. Took it in Saturday and swapped it out. Easy Peasy right? Wrong. Got home and hooked up new box....nothing. No signal to the TV from the box. Of course technical assistance (really should come up with a better name for them) explained how it HAD to be my HDMI cable (because that's what the paper told her to say). Too late by now to get back and get another....no cable for weekend. Took box to store Monday afternoon and swapped again...assured there would be no issues. Got home and plugged it in and went through all the set-up and voila...we have cable. Problem solved? Not by a long shot. Wake up Tuesday morning and put TV on....nothing. Go to main box...nothing. No cable for tuesday either. Tech (who had been scheduled earlier) is to be there that afternoon. He walks in, looks at it and fixes it with just a few quick swipes of his hand. Explains to me when they put in some information into system they made a mistake and it tells the system to shut down the box when the update runs at night. So now it's fixed, right? Wrong! Same exact thing happened last two nights. Every morning i have to reprogram the main box just like it came out of the box from the factory. Only thing i get when I call in is "SORRY" and we can send a tech out. Already did that and he siad it was a problem with the office. I did get them to refund me for the days I was either without cable or have to fix their equipment. Really interested to hear the reply to this.
Have no fear, it get's better. I will be in to the store again today, for the third time in less than a week. Now the box will not boot up. Box went out while we were watching it last evening and hasn't come back since. Tried to "reboot" a couple times last night to no avail. Got tired, went to bed. Woke this morning and tried again before I left for work. When you "reboot" the "welcome" screen comes up and makes you wait a while. The digits on the front of the box show a bright "B" and a dim "oot". Finally the box just got tired and quit sending a signal to the TV. I have to say, I am beyond mad. It is almost to the point of comical now As far as anyone thinking I am crazy about what's been happening....every night we have recorded shows to watch later and every morning they are erased. I am not sure how else to put it but the box has been resetting itself each night since this began. What makes it sad is technical assistance (really just an operator reading prompts from a list) has repeatedly told me that my HDMI cable is bad. That's the best they could muster. By this afternoon we will have been without cable for more than 8 continuous hours for 7 days and this will be the 4th box. I am only asking to receive the service we pay for.
I will be at the Cox store around 4:00 this afternoon. Is there ANY chance i could meet with SOMEBODY who might have a clue how to fix this?
If the same thing happens with every box, the issue probably isn't the cable boxes. You most likely have a poor signal.
I know it sounds silly but have you tried changing the HDMI cable? I was having similar problems as you and changing the cable to one rated for 8k fixed the problem. The system worked fine and then "poof" it stopped working ( I did NOTHING TO IT ). HDMI cables are known to be cantankerous. For 13 bucks it saved a lot of grief. Best of luck.