Motherboard problem, HP TouchSmart TX2

Hello..

My Problem is: i have a HP TouchSmart TX2 laptop. and when ever i shutdown my laptop i cant turn it on again. i need to hold on to the power button for about 30sec.
then i can turn it on. by now i still can use it. but it really makes me worried.

Model : HP TouchSmart TX2 s/t: tx2-1115au
OS : Windows 7 Ultimate 32bit
Ram : 4GB from original
HDD : 320GB from original
 
erm...

sorry what i mean is... it will turn on... but there is no display on the screen. then i need to hold on the power button for about 30sec. then it will go on...
 
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