[SOLVED] New mobo but display blank

[Habil21]

I just put a new mobo in my laptop and tried starting it without the hard drive but with ram, I got a blank screen and after some research it appears that corrupted ram could be causing this, I also tried starting with the HDD installed but there was no difference, I then tried without ram and HDD and got the same result.

I'm not getting any beep codes and the fan is spinning and varies in speed.

Before I get another ram stick could there be anything else causing the problem, a dud mobo? But the fan works and there are no beep codes.

Thanks in advance.

 

[rgd1101]

need detail spec

 

[Habil21]

Sorry, it's a HP 15-ab291sa, Intel i5 with integrated graphics, the new mobo is i7 and Nvidia 940m. 2TB Samsung HDD and 8gb ddr3 1600mhz Kingston ram.

Also the motherboard didn't have a CMOS battery installed when I got it, I installed a new one before trying to start the laptop.

And I didn't have the laptop battery installed, could that make a difference?

 

[Habil21]

And I have had the following advice:
Changing motherboard
Reinstalling os

 

[hang-the-9]

Could be the motherboard you got is bad, or won't work with your power supply since it has different specs from the original setup.

 

[Habil21]

PSU is the same for both mobos. I've ordered more ram.