Lenovo ideacenter pc motherboards are like that, the harddisk is getting power from motherboard, not from lenovo original psu. You can use adapter (only a few $) to convert any psu standard atx 24pin to 10 pin on the motherboard. But take note that as it is using only 12v rails on the 10pin, once you power off, the psu fan will still be spinning, you need to off the main switch then the fan will be off.
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