I am having the same issue, figured it was an overheating issue, so I took out the fan and it was plugged solid. Cleaned it all out but it still wouldn't even get to POST. I then was feeling the heat sink on the video chip and while pressing on it, the laptop started and booted up until I released the pressure on the chip. I bought some thermal paste and redid that chip and found that it actuall wasn't the problem. Tracked it over to the fan connection on the MB. If I hold down that connector, it starts up but as soon as I release it, the laptop shuts off. I am waiting for a local PC store to open to either purchase a new fan or get the conector re-crimped. Will try to let you know my results, hopefully this is it, otherwise its my MB and thats not worth replacing.