Poor ac adapter - Celestron NexStar 127SLT Computerized Telescope

I received a NexStar 127SLT telescope for Christmas this past December. After opening the box, I found it did not come with an AC/DC power adapter, and most reviewers said it was crucial to purchase one. I decided to order one from Celestron in order to make sure it was compatible. The adapter came, complete with Celestron’s name attached. Between weather and not having enough time for setup and tear down, I have only used the telescope for a total of 30 minutes. I was setting it up (putting in longitude and latitude, etc.) a few days ago, and when I moved it outside and plugged it in, the handheld controller started flashing, and none of the buttons worked. I looked up this condition and saw that it says when you have this situation it indicates the AC power adapter is bad, and needs to be replaced. 30 Minutes!!