Only thing to do is buy a new modem. Mine did the same after a power surge. Left it all night off and in the morning started working again.
a month later, another power surge and never started egain. Just got me a new one and called Comcast to activate it. Problem solved.
Good luck there
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is there power to the monitor? is the monitor in standby(yellow light on monitor)? is the monitor on (green light on monitor)? how is the monitor connected to the computer, VGA (square fat cable, the end may be blue) or HDMI cable? When you turn on the computer is the power light on and HDD light flashing / showing activity? this would indicate that the computer is booting up. If you have power light and activity on the computer, I would unplug the data cable to the monitor. If the monitor is plugged in, i would press the power button to try and turn on the monitor / take it out of standby. If the monitor is ok you should see a message like "no signal" or "no input". This would tell you that the monitor is fine, but you may have a problem with the video card or video port on the motherboard. If you have no activity light on the on the computer, you may have a problem with the OS not booting up. You really didn't provide much detail on what has been done, but this is how I troubleshoot out in the field when working on something like this.
Very first thing you should have done is to check the ground between the vehicle frame and trailer frame. That's the only thing that can be causing this problem. Be SURE the grounds are connected very well. I've found the ground to be the only problem in these situations every time. Can't be anything else, it's all good.
When you say that you slid your finger back and forth on the strip
do you mean the strip along the back of the laptop just below the screen ??
Because on some laptops the wifi switch and cap locks and the mute switch are all along
so you may of by accident pushed them all and de activated them all
pressing them all in turn should activated them again but if they done
then you could try FN+ the keys that you want to activate
Try to take out the battery and just use the adapter to power it on, If your done with that then try just using the battery to turn it on, if it still won't give a single light. If you can borrow an ac adapter for that laptop try it , If it still doesn't work. You'll need to replace the motherboard. Just make sure the ac adapter your gonna use is working good.
If you are referring the green or amber light on the front of the case, it could either be the power led or the hard drive activity led. If its the hard drive activity light, it usually just blinks when a program accesses the hard drive.
What laptop brand and model is it? And where is the LED that blinks? Important details! Some laptops have a power light that blinks red while battery charges, then it turns steady green when battery is full. Some laptops have a red LED that lights whenever there is hard drive, CDrom, or floppy activity (read/write). This all depends on your laptop brand/model and where the LED is (side, near floppy/CD, top near screen, or on battery itself... so provide more details for me, please!