My PC build wouldn t power up after I finished it....

My PC build wouldn t power up after I finished it. Upon trying everything myself I finally decided to take it a store, no one could figure it out. Took it to 2 more shops and nothing, one guy even told me I needed a new motherboard. Went to the computer factory and within 15 mins they had it running and all it was an extra cord that didn t need to be plugged in. 10/10 people with nothing but honesty and will only be going going here from now on. Thank you computer factory!!