Satellite U400-10N fails to start while showing black screen!

So i press the power button, The 3 Leds are appearing fuctional but the CPU-GPU fan fails to start!
After a while it shuts off it self and then it tries to start again but the fan fails again while only the power led is on and not the others (Led 1 and 2 on the bottom).
Must say again that the screen appear always black (might be dead also)
I thought it was an overheating problem so i cleaned up the fan but with not many signs of dust!
But that was crearly not the problem because i tested it!
Now i think it might be a GPU problem but i dunno for sure!
Any suggestions what it might be and how o fix this? Thank you!

Hi
It can be RAM problem, it can be an motherboard problem, it can be also an CPU or GPU problem.
Any part can be affected.
So what to do?
You could check part like RAM. You could purchase new, good tested RAMs and could replace it but what happens if you purchase new RAM modules, replace it and notebook would NOT power up?
You would spend some money for new RAM but finally other part could be faulty
Therefore I think an professional service technician should check the unit firstly.
The guys could give you a proper answer about the faulty part and then you could decide what to do
You know what I mean?

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