PC wont go into sleep mode

SNEAKYZACK

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Feb 12, 2016
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So I swapped out my old Mini ITX motherboard for an ATX one (Gigabyte Technology GA-Z97X-GAMING 7) but when I put the PC into sleep mode it acts more like hibernation(S4 mode). How can I change this to S3 mode? As far as I can see there is no option in the BIOS.

Edit: also when I click sleep it powers down everything almost instantly. Before it would say the pc is going to sleep and then everything would stop slowly not abruptly like if I had held down the power button. Also with the old mobo the led on my power button blinked in sleep mode now it just stays off unless the PC is awake