Have a laptop and I'm trying to decide which part is causing this problem. If the laptop is powered sits for a while (hours), the display works fine for about 60 seconds and then goes very dark. I can barely make out the image but it's there. External monitor works fine so it doesn't appear to be the video adapter. I've narrowed it down to the inverter or the CCFL. Both are pretty cheap to buy but the inverter seems to be easier to replace. Is there an easy way to tell which is causing the problem?