Problem with Xbox 360 powering up.
Problem with Xbox 360 powering up.
The issue seems linked to your power adapter. Recent reports suggest checking for USB shorts, but none were found. Some advice points point to the RF board, power button cable, or a specific capacitor needing removal. Your second Xbox 360 behaves differently, which supports the adapter concern. Considering you already have a new one on sale, it might be worth replacing if the problem persists.