darkbreeze said:
I would double check your connections as Karsten75 suggested but in the meantime let us know the specs on the PSU as well.
Sure, here's the full list of components that I used:
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CPU: Intel Core i7 4790K BOX LGA 1150, 4th Gen
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Mainboard: ASUS Z87 PRO LGA 1150 ATX
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PSU: Corsair AX760 (760W)
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Case: Fractal Define R4 - Black Pearl
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CPU Fan: Noctua NH-D14 (120mm)
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Ram: HyperX Fury Black (2x, 8GB, DDR3-1600, DIMM 240)
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HDD: Seagate Desktop 2000GB, 3.5",
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SSD: Samsung 840 EVO Basic 500GB
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Optical Drive: Samsung DVD-ROM SH-118BB/BEBE
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GPU: Currently just on-board graphics. No GPU installed.
Regarding the cables: I have disconnected SSD, HDD, DVD and the front-buttons (reset/power on/off) and have been using the mainboard power button to start into the BIOS and try resetting from there. I have the same problem this way so I don't think it's related to the SATA devices at all. I did this to see if there is some sort of short circuit or similar with those buttons.
The PSU should be a good one I reckon. Certainly it wasn't cheap.