Laptop boots Black Screen

Recently, I had this laptop a new HDD, been playing with him for almost two weeks, and now whenever I try to boot it, it only appears a black screen, the pc light's go on, I can hear a fan for 5 seconds, propably its only the Hard drive, then off again, the laptop just stands there with a black screen.

Its an Insys Notebook Computer
Model: M761SUN

I did some research, I already tried unplugging the charger, then battery, holding the power button for 60 seconds, plugging it all again, and it didnt work.

I read something about the BIOS's CMOS battery, that it could be weak or out of battery (?) , and that it needed a replacement, im going to post some pictures about my laptop open, because I dont see a way to replace the battery.

So... do I need a new BIOS battery? Or is there aonther way to fix this (low cost) ?

Images:

Open back of laptop:

Battery (not sure if this is actually the CMOS's battery) :

Some laptops have a button (up by the F-keys) with which you can switch the screen off. Maybe you hit that accidently.

whs said:

Some laptops have a button (up by the F-keys) with which you can switch the screen off. Maybe you hit that accidently.

Already tried that, nothing happened , pressing every key and combo of FN+F*, still nothing

Tyrandis said:

If this is a hdd then turn on your laptop and put your ear on the hdd to see if the disk is moving because if you don't hear anything or if you hear really bad scratching sounds then it means that its your hdd.

The HDD makes a the normal sound as if its normaly booting, what is not booting is the screen, I cant even hear the fan working, all of the leds are on, the HDD activates and after a couple of seconds stops, and I hear no sound coming from the laptop :/

Can you feel air by the fan port when it boots up? I had an old HP laptop with a jammed up fan that did exactly what your machine is doing. You may have a dead fan. This causes the processor to shut down to protect itself and voila! No boot.