Problem with Shutdown

[10mm_peter]

I've had a problem with my computer that started a few months ago. When I turn off my computer or put it to sleep, all my fans stay on and my motherboard stays lit up. When shutting down, it goes through the entire process of turning off, even turns off the monitors but there still seems to be power going to all the fans and lights in the machine. The only way I have found to fix this problem is to put the computer to sleep, wake it up. After I do this I get a CF code on my board, but it will sleep fine and shut down fine.

Have already wiped and re-installed Windows 7 so shouldn't be a software issue. Any help would be greatly appreciated.

Windows 7 64bit

Intel Core i7-920 Bloomfield 2.66GHz LGA 1366 130W

G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600

HITACHI Deskstar P7K500 HDP725050GLA360 (0A35415) 500GB 7200 RPM SATA

DFI LP UT X58-T3eH8 LGA 1366 Intel X58 ATX Intel Motherboard

SIGMA MONSTER SP1000C 1000W Continuous @ 40°C ATX12V 2.2V / EPS12V 2.91 SLI Ready CrossFire Ready Modular Active PFC Power Supply

SPARKLE SXX260896D3S-HP GeForce GTX 260+ Core 216 896MB 448-bit GDDR3 PCI Express 2.0 x16

 

[10mm_peter]

No ideas?

 

[10mm_peter]

Just replaced power supply with a Antec High Current Pro HCP-850. Still have the same problem. Now starting to think it's the motherboard.