Just bought a new power supply

Hi, I just bought a new Cosair 550W power supply, everything is working ok however when I put my pc in sleep mode the blue led lights on my case don't turn of.

This did not happen with my old psu, is there any way I can get them to turn off, without turning the fans of permanetnly.

The case I have is the Antec 900.

Thanks.

 

anyone?

I still don't no how to fix it.

 

Which LEDs specifically?

 

Its the ones which are on the fans.

 

There is an issue with some PSUs where they can leave the 12V rails powered when the system is switched off. Either turn the switch off on the PSU when you're not using your PC or replace the PSU.