Asus Z87-K Standby LED Always on

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The green standby LED on my motherboard is always on. Is this normal?
 
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Thanks . I have been having performance issues with a gtx 760 (I think its a gpu issue). I was just checking out all possible problems. Is there any way to check if power supply has any problems?
 
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Cpu is I5 4670K & PSU is 600 watt FSP 600-50ARN. It meets recommended requirements but I was trying to find out if it is working at full capacity.
 
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Sorry. I should have made it clearer that I have already sent the 760 back under warranty. I am replacing it with a 770. The system builder asked me to send my system event log. From this information they said the gpu driver was crashing under normal usage. They said it was most likely a gpu card fault but less likely could be a PSU issue so I am swapping out the gpu first. I didn't know anything about the system event logs. I am going to read up on diagnostics and using the event log as it sounds really interesting. Looks like gobbledigook at the moment.
 
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Information is pretty patchy on fsp. I think there are 42 amps on the 12v rail.

I just wondered if there was a stress test for PSUs like Prime95 for cpus. I suppose the best test will be running Arma on ultra with a stupid draw distance.

I am not sure about swapping out a PSU. Is this relatively pain free?