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OverheatingWhen the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.
it seems that you have damage memory card replacing may fix a problem but its better for it that you bring it to a technician in order to check much better because the motehrboard may possible be the problem.
Sound like LCD problem. Try to drain the electorstatic charge of the board for this sometimes the cause of no display while computer is turned on. I wrote a tip on how to do this. Please click here.
If this will not work then you have a bad LCD there and needs to be repaired.
May be there is a problem in the windows, but suppose it is not booting at all.
First Check once more your boot options from bios menu Second If it still the same thing, extract your battery out of your laptop for 12 min, then try to power up your laptop pluging in your power cable(don't use your battery) Third If it still not working, there must be a problem in your cooling fan, so check it, also check your motherboard & your graphics card (Most of this problems happens due to a problem in the computer cooling system in motherboard & graphics card)