I just got a HyperX mod chip and I installed it into my xbox. I went to turn it on(with the mod chip switched on) and just get a blank screen. No sound or nothing. When I switch my mod chip off the xbox works fine. Normal screen and every thing. The place were I bought the chip said it came pe-flashed with cromwell on it. I think I have a Xbox 1.6. Could someone please help me!!

Return the chip and get something better.
That's the best thing you can do for your xbox.