Altera FPGA LED switches OFF after loading the sof file

[Altera_Forum]

Hi all, 

 I am trying to load my Altera Arria - II FPGA with the .sof file generated. The loading is successful but the FPGA LEDs switches OFF when it is supposed to turn ON. When I program the FPGA with a .sof file generated by my colleague who uses the same project, it works. My question is can u tell me as to why does this happen??  I did a subversion checkout of the project file, opened .qpf file in quartus software, compiled it and tried loading the .sof file using the programmer. Could you guys tell me what should I do to correct it??..Does it have to do with Operating system?? We both use the same Quartus II 64-bit version 14.0.0 Build 200 software from Altera.

[Altera_Forum]

How is this LED operated? what is it connected to? What is this sof file? are you programming the same .sof file as him?

[Altera_Forum]

so basically I am using the same base project as my colleague, compiling it and trying to load the .sof file into the fpga. Unfortunately it does nt work for me. When I load the .sof file created from his project, it works fine. 

Its very hard to debug because there are no errors indicated by the quartus software.

[Altera_Forum]

Your post has far too little detail: 

What LED is it? one of the ones connected to the FPGA or some other FPGA peripheral? Did you compile it with the same version of quartus (linux/windows and 32/64 bit are all different versions, even if the version number is the same). Does it have full timing specs? Is it on to the same board?

[Altera_Forum]

--- Quote Start ---  Your post has far too little detail: What LED is it? one of the ones connected to the FPGA or some other FPGA peripheral? Did you compile it with the same version of quartus (linux/windows and 32/64 bit are all different versions, even if the version number is the same). Does it have full timing specs? Is it on to the same board?  --- Quote End ---    Well I was able to make the LED blink by loading the NIOS II with the firmware through eclipse compiler. However I was getting error with cygwin because I have a Windows 8.1 OS and after searching for solutions in the Altera forum, I installed an updated version of cygwin and loaded the quartus/cygwin/bin with the new updates bin files. So the current status is I solved this cygwin error but I have one error which is Error : 127 and my .elf file is deleted from the project folder. Could you tell me what do I need to do with it?? I found that it has got to do something with the PATH variable in the environment variables. I tried the solution but it does not work. I found a post in the Altera Forum similar to the error :127 I have got but there is no solution for that post. Can you guys tell me what should I do??

[Altera_Forum]

well the problem is solved. The solution was to install next version of quartus 14.1. I had an older 14.0 version and was not compatible with the windows 8.1 OS. I had problems linking the BIN files of the quartus.

[Altera_Forum]

I believe the older Quartus II versioin might have compatibility with the new OS. You can check OS compatibility with Quartus II at https://www.altera.com/support/support-resources/download/os-support.html