No SIGNAL , new GPU

[elPresidente]

If you put the other gpu it works?

 

Yes , the other GPU works just fine.

[Neuckretion]

Yes , the other GPU works just fine.

Try putting the old gpu and uninstalling nvidia drivers and then put the new gpu and see if that helps

[elPresidente]

Try putting the old gpu and uninstalling nvidia drivers and then put the new gpu and see if that helps

 

 It won't help , as I said , the PC does not even get to POST screen , the hard drive has not activity at all.

[Neuckretion]

 It won't help , as I said , the PC does not even get to POST screen , the hard drive has not activity at all.

Can it be a problem with windows? I mean, do you have another hard drive to test it? 

[elPresidente]

@Neuckretion

 It has nothing to do with the windows or any other software .  It is simply a hardware problem.

[Flashie]

Is the motherboard PCI-e 1.0, it may be incompatible because of that. I don't think there is any workaround for that unfortunately.

Read this: http://www.overclock.net/a/the-final-answer-to-the-controversial-pcie-x16-version-compatibility

 

Read the end of that post - I read through it this afternoon and found that he did eventually find a fix for it, but it is not applicable to all motherboards since some companies did not roll out the compatibility update.