I just assembled a new machine: Antec GX500 Black Steel ATX Mid Tower Computer Case CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 15000) EVGA SuperNOVA NEX 750 G 80 PLUS GOLD Certified 750W Active PFC ATX12V v2.31/EPS 12V v2.91 SLI Ready Logitech K750 Black USB RF Wireless Slim solar-powered Keyboard Logitech M310 Flame Red 3 Buttons 1 x Wheel USB RF Wireless Laser Mouse ------------------------ ASRock Z77 Extreme6 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard ICY DOCK MB971SP-B DuoSwap 5.25" Hot-Swap Drive Caddy for 2.5" and 3.5" SATA HD/SSD Intel Core i7-2700K Sandy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623i72700K OCZ Vector 150 Series VTR150-25SAT3-120G 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD) OCZ Vector Series VTR1-25SAT3-256G 2.5" 256GB SATA III MLC ZALMAN CNPS9700 LED 110mm 2 Ball CPU Cooler 1st group of times newly purchased 2nd group I had When I shut the machine down, the CPU and case fans continue to run, and the SSDs are getting power also. I have to shut the PSU off to get them to stop. After Googling this issue I find I am not alone, but most articles are from a few years ago. I did try one suggestion, boot to a Linux base USB, I used my OCZ bootable toolbox, and shut down from there - it worked fine - this seems to indicate a hardware problem according to the article. I am tempted to say the issue is the PSU, but nowhere near sure. Before I buy another PSU I though I'd see if anyone here has any ideas. TIA Just as an FYI - even before this issue was discovered, I decided the case and PSU were not very good, but they were cheap..