There are many sites which will explain how to fix it, but opening
your xbox console voids the warranty. Just send it to Microsoft. The
problem occurs when there is too much heat, you can try one of the
external coolers. It is fixed by opening it up and putting on more
cooling paste to the chips, because the old paste on older consoles
gets burnt. If your console doesn't have an HDMI port, send it to
Microsoft to get one with the new version.