Is it the TV HDMI socket or the DVD that does not work? Sometimes the HDMI board on the TV dies. And sometimes it's just a glitch. Turn the tv off. Try unplugging the tv from the wall for about 10 minutes. While it's unplugged, remove any HDMI cables attached to it also. After about 10 minutes replug the HDMIs . Turn on the DVD player first, wait about 30 seconds, then turn on the tv. See if the reboot fixes the problem.If you are then sure it is the DVD player go back to the shop and insist on a replacement according to the stat law a DVD player is made to last longer that 13 months and you are entitled to a replacement or repair.