New
#21
OP has same problem with a 650W and 750W PSU and a 17 Watt CPU/IGPU unless he got those PSU's out a dumpster or new Egg refurb it's a long shot both are bad . (ofc not imopossible ) but if they run in another PC or mainboard they are probably fine.
OTOH bad drivers can sometimes cause re boots or even totally hose the OS altogether .
EDIT if I'm reading your system specs above my wattage figures are going to be off ☻☻