pc with good components won't start

Feb 21, 2018
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Hi, today I bought a new motherboard (acer RS880M05A1) and a new swtiching power suply (atx-500w)
After seting up these two components, I tried to turn on the pc, but I couldn't, it won't start, I'm also using a new power cable, but nothing's better, i thought that my lc could'n recieve electricity......

please, help me!!!!!