Contact GHD asap. That's how I knew something was off with my straightener. The first time it happened the same thing to me, I turned it off, removed from the plug and waited and tried to turn it on again but I still get the red light flashing on and off. I tried doing it for a few times but still had the same issue so I contacted GHD and they replaced my straightener but after a few months it happened again. It sucks because for the price we pay for these straighteners we expect quality but unfortunately it isn't the case with these products.
I got this recently since it was somewhat affordable and I was in desperate need of a replacement flat iron. I didnt plan on it becoming my main styling tool but for the affordability of this tool, I am SO impressed with the quality! It heats up in a matter of seconds, gets super hot which means a lightening fast styling time, and it's available from Nordstrom which is my favorite retailer to shop!
I gave it three sticks because my hair did eventually get straight and at no point did I feel like it harmed my hair, but it's not even adjustable because again, the company claims that this iron auto-adjusts according to hair "conductivity" or some bullshit like that (this is a laughable claim). It does have auto-shut off but so do a lot of irons (or at least the high end ones). Honestly, I can only conclude that this is another one of those hyped up beauty products aimed at people who think more $$$= better product and performance but a straightener is a straightener so once you get past the $100 price point it all comes down to personal preference and there's really not much more you're gonna get for your money...
BEWARE of sellers with LOW FEEDBACK! Ask sellers questions about the 22 things I have pointed out above. If they do not answer, don't buy! If they make excuses, don't buy! Also, some buyers who have been ripped off are trying to resell their GHD's to cut their losses. Watch for things like "I got it as a gift" or "I recently cut my hair". One of the seller's I purchased from was supposed to be shipping out of Georgia but he really shipped from China. Don't believe everything you read about a seller's information. They can lie.