|Hi, I had the same problem and I finally figured it out. |
Keep in mind this is not a permanent solution, but if you are in a hurry or can't afford a new monitor right now, this is the way to fix it.
If the monitor is too cold, literally, in terms of temperature, (I suppose the transistors can't charge up enough) it won't start up or will take ages to warm up (and you will see the power led blink on and off until it does). The solution is to heat up the monitor, by, for example putting it in the sun (or in oven at around less than 50 degrees celsius) for a while, and then after connecting it again, it should power up in less than 5 minutes, which in most cases is better than waiting 5 hours. An even better alternative is to keep the temperature of the room the monitor is in quite warm, and then it will always power up relatively quickly, taking around 0-5 at around 20-25 degrees celsius. I know it sounds stupid but it does work, at least it's been working for me for the past year or so (and I can't be bothered to buy a new monitor)