Question PC shuts down instead of entering sleep mode ?

[imspiffy]

Every time I try to put my pc into sleep mode, it just shuts down instead. Also it doesn't shut down instantly but it takes a couple minutes to do so. I am not sure if its a hardware issue or software, but I've been having this problem for quite some time. I tried adjusting some power settings and nothing. Even tried going into BIOS to see if I can find anything there but I'm not sure what I'd be looking for. Does anyone know what might be the issue?

 

[Aeacus]

Desktop or laptop?

Full system specs, including PSU make and model (or part number) is? Also, how old the PSU is, and was the PSU bought new or used/refurbished?

Does anyone know what might be the issue?

If desktop PC, could be that your PSU doesn't support high CPU sleep states (C6, C7, C8) and instead shuts off the PC.