nvidia - Sony Vaio Fit SVF1521V1EB Cannot access secondary GPU

As a new Ubuntu user I've tried several distro's including Mint. Everything works except
for my graphics card. The laptop has an GT 740M gpu which has Optimus. Now I've tried a lot of tutorials to the 'Cannot access secondary GPU' issue, including installing bumblebee, primus and a lot of other things including the linux headers. Ive also edited
the .conf file changing the Driver= to Driver=nvidia-current method.I'm running 13.10

Nothing works, sometimes I get a black screen, sometimes nothing happens. But I always end up with the same error:

[ERROR]Cannot access secondary GPU - error: Could not load GPU driver
[ERROR]Aborting because fallback start is disabled.

when Using the lspci | grep 3D command I get: 01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1)

Opening my /etc/bumblebee/xorg.conf.nvidia I get:

Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "false"
    Option      "AutoAddGPU" "false"
EndSection

Section "Device"

    Identifier  "DiscreteNvidia"
    Driver      "nvidia"
    VendorName  "NVIDIA Corporation"

#   If the X server does not automatically detect your VGA device,
#   you can manually set it here.
#   To get the BusID prop, run `lspci | egrep 'VGA|3D'` and input the data
#   as you see in the commented example.
#   This Setting may be needed in some platforms with more than one
#   nvidia card, which may confuse the proprietary driver (e.g.,

#   trying to take ownership of the wrong device). Also needed on Ubuntu 13.04.
    BusID "PCI:01:00:0"

#   Setting ProbeAllGpus to false prevents the new proprietary driver
#   instance spawned to try to control the integrated graphics card,
#   which is already being managed outside bumblebee.
#   This option doesn't hurt and it is required on platforms running
#   more than one nvidia graphics card with the proprietary driver.
#   (E.g. Macbook Pro pre-2010 with nVidia 9400M + 9600M GT).
#   If this option is not set, the new Xorg may blacken the screen and

#   render it unusable (unless you have some way to run killall Xorg).
    Option "ProbeAllGpus" "false"

    Option "NoLogo" "true"
    Option "UseEDID" "false"
    Option "UseDisplayDevice" "none"
EndSection

I came across this issue when I tried installing Dead Space 2 using PlayOnLinux. It kept giving me the error that my laptop didn't meet the required specifications.

Remember, I've tried a lot of tutorials and google and nothing worked, so if anyone could give me a detailed explanation and fix in such a way I can understand;
This is no longer an annoying issue, I want seriously want to know how to properly troubleshoot and fix these kind of problems ;)

Thanks a lot in advance!