Satellite P20-S203 shuts down suddenly

Hi,
In the last month my Satellite P20-S203 is not behaving so well, and unfortunately it seems the problem is a hardware one (but I'm not sure, and that's why Im writing here)
The computer just shuts down suddenly (it happened 2 or 3 times in the last 30 days); all the times it did happen I was on the web on Firefox, but I'm pretty sure it has nothing to do with that, and I'm also 99% sure it's not a virus, malware or anything like that, cause I formatted about 3 months ago, and nothing else behave in a strange way, the computer is not slow or anything like that.
The last two options are that the issue may be of hardware nature, or of a software one (like a conflict between installed programs and the OS); I'm more for the first one, but I'm not sure and I need help to find out... What should I do?
Also, when it suddenly shuts down, it won't turn on with the first try.
It needs like 10 or 20 times to open, like an old car that doesn't start; the first, say, 5 times I try to turn it on, it will only display the toshiba logo.
Then it passes through a screen I cannot read because it's too fast.
Then to a black screen and finally it turns off again.
With the next tries it goes a little bit more far, like it displays the windows logo, but, as that picture fades in, it stops at half of the fading process, resulting in a darker windows logo, like it's too hard for it to load the OS!!
But then it goes off again!
Then after some other tries it finally loads windows.
Any help would be highly appreciated, thank you!
OS: Windows XP SP2

No it's ok Jayjay, I purchased this morning the right screwdriver (here in Greece these type of screws are called "French" or most internationally "torx" screws).
So I took away the cover above the fans, unscrewed the heat sink, removed the heat sink and together with that the cpu came up. I've now removed the old thermal grease and I'm ready to put the new one.
I like to mess around with things, I like to assemble and disassemble, I like to know how things work...but I also know, thanks to my personal experience, that there's no way not to make any damage when you mess around :) but that's ok with me, I' m used to it, as soon the pc will open once finished :D
Anyway, I have to admit that if I worked with a little more method now everything would be ok, like making a map of the screws, knowing where to put them back, because now two screws on the back won't mount any more (precisely the F6 screws on the back panel, where the usb, vga and parallel connectors are), and two more screws are in excess (!) If someone has the time to do it, please unscrew just these two screws (the F6 on the back) and post a photo of the screws, or just tell me the height, even if I'm sure that the problem is elsewhere.
Goodbye

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