so i have Aqueon 150 watt aquarium heater in my 40 gallon tank and ever since i did a water change today the heater has not turned back on. I have tried unplugging it and plugging it back in, turning it up to full heat and after both of those attempts to fix it i waited for roughly 1 hour and still the light that indicates the heater is on has not turned on... please help I really don't want to go buy a new one tonight haha...any suggestions??