PC not powering on...brand new PSU

Discussion in 'Power Supplies and UPS's' started by stonecpreston, Jul 31, 2012.

  1. stonecpreston

    stonecpreston Geek Trainee

    Likes Received:
    0
    Trophy Points:
    1
    ok so last week my power supply in my pc went out. I bought a new coolmax 700 w psu today and installed it. LED's come on the MB but it wont power up. we have a very old dell desktop sitting in the attic so i took the PSU from that( its rated 300 W) and connected it to the board. bam. it starts up. Ive tried switching the psu switch on and oof plugging it back in, reconnecting the motherboard. I did have some trouble getting the 20 pin + 4 connectors in. I imagine because it was brand new. I have never replaced anything in a computer before. But i figured i could do this. Im having the same problems with this new psu as i did with the one that went out. Surely its not a bad one. Any tips.

    specs :
    coolmax 700 w psu
    asus p7h55 MB
    intel i3 processor
    4gb ram
    radeon graphics card (nothing special)
    my old psu was rated 500, the super old one i stole from the dell was 300 so i know its not a wattage issue.
    help me please. Im so frustrated.

    edit:
    the old psu that went out is a 24 pin. that wouldnt make a difference would it? the only thing i can think of is that its a bad psu or i dont have it connected to the board well
     
  2. Ghostman 1

    Ghostman 1 Moderator Staff Member

    Likes Received:
    85
    Trophy Points:
    48
    Did you try the new power supply into the old computer from the attic ????
     
  3. Ghostman 1

    Ghostman 1 Moderator Staff Member

    Likes Received:
    85
    Trophy Points:
    48
    All new PSU's should come with a power cord, But now days most of these cords are real short and allot thinner....I don't use the thinner cords, those thinner cords can get hot..
     
  4. dai

    dai Geek Trainee

    Likes Received:
    0
    Trophy Points:
    1
    i would not recommend coolmax to my worst enemy
     
  5. avior

    avior Geek Trainee

    Likes Received:
    1
    Trophy Points:
    3
    buy looking at you motherboard you connected the 24pin connecter right did you also connect the 8 pin connector to your motherboard
    you need to connect that as well ?
     
  6. Big B

    Big B HWF Godfather

    Likes Received:
    145
    Trophy Points:
    63
    While I would also highly recommend running away from that Coolmax unit ASAP, in the meantime, yes make sure all power connections to the motherboard are plugged in.

    When you say the stock Dell unit went out, what happened? I ask because sometimes, a PSU death can take components with it.
     
  7. Smith John

    Smith John Geek Trainee

    Likes Received:
    1
    Trophy Points:
    3
    Power cable can be the main issues rest is then primary once,check that then go for other if not solved
     

Share This Page