Toshiba Portégé m400 powering up but not booting problem

Hi people this is the first time I have posted on the toshiba forums. My toshiba m400 tablet laptop stopped booting recently and I am unable to find an answer to my problem. The laptop is refurbished I bought it off e-bay 6-7 months ago so the 2 month warrenty is out. It worked fine up until recently History: about 2 weeks ago it started to hang then about 1 minute later the fan would go really loud and the only way to get the laptop to work was to pull the power and reboot, it started off about once per day I thought that it was just weird and ignored it until it got more frequent. then about 1 week later it when I tried to boot the laptop the power light would go on and nothing would happen then a while later the fan would start being really loud. What I tried: I replaced the battery as I thought it was a power issue, still not working I did some research and thought it might be a over heating issue because of dust.I got a techncian friend to look at it they opened it up and cleaned the dust out, still not working Connected it to an external monitor in case it was the screen that was not working , the screen didnt show anything Currently I push the power switch and the 1st light from the left, the power light goes on and I can hear the fan and hard drive working but nothing is displayed on the screen and I dont think the system is booting. The same thing happens regardless of what battery I use or if the laptop is plugged in. So currently my laptop is a paperwieght does anybody have any suggestions besides buy a new laptop

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