I have a Toshiba Satellite C55- A5104. When I try to boot up the laptop, I hear the optical drive making a brief noise, but the computer does not boot up. The power button light, charging light, and power light all come on, but screen remains black and the typical noises of boot up are nonexistent. I am assuming my motherboard is shot. I am willing to replace it on my own, though I had Windows 10 as my OS, and not sure how I am going to go about replacing that, but I am wondering how much I am looking at for cost if I were to replace the motherboard myself versus having a professional replace it. Also, if replacing myself, are there any things I should be aware of before making the attempt? This laptop has been sitting for well over a year since the issue showed up, but I would like to be able to use it again because the computer was not very old when the issue happened. Any information would be very much appreciated. Have a splendid day!