I have a p150sm which has a seemingly dead 780m due to a perpetual error 43 which came after a big BSOD about 6 months ago. I upgraded the laptop to a 980m and modded the inf files. The upgrade was perfectly fine for a week. One day, i left the laptop and something related to sleep or power may have caused the laptop to shut off. Since then, the laptop with the 980m won't boot. I tried many things like resetting cmos, taking out the hardware and putting it back in, and resetting bios, and buying a 230W adapter. Nothing worked. The laptop works fine with the old dead 780m in there, but now when the 980m is in there, holding the power button generates a green light flash and then the power LED goes back to orange. No sounds, maybe one tick, and that's it. What is left to try?