System not booting

Hi all

I am by no means an expert but I have built few systems under supervision of my friends years ago. Yesterday I tried to build my new system by myself, so please advice accordingly to my skills :)

Everything went smoothly and following forum guides I was able to put all components together and wire up everything. Then I pressed the start button….and nothing happened. The system never turned on. I unplugged all wires, connected them again, tried different PSU – MOB connection cables, read MOB manual again and again, basically did everything I could following this topic: http://www.tomshardware.co.uk/forum/261145-13-perform-steps-posting-boot-video-problems

Here is the hardware list:

CPU: Intel Core i5-760 Lynnfield 2.8GHz 8MB L3 Cache LGA 1156 95W
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115067&cm_re=Intel_Core_i5-760-_-19-115-067-_-Product

MOB: ASUS P7P55D-E LX LGA
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131634&cm_re=asus_p7p55d-_-13-131-634-_-Product

PSU: FSP Group FSP650-80GHN
http://wellcom.co.il/catalog/product_info.php?products_id=9741&language=en

Video card: GIGABYTE GV-N450OC-1GI GeForce GTS 450
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125341&Tpk=gigabyte%20n450OC

RAM: Kingmax 2x 2GB 1600Mhz
http://www.kingmax.com/en_03_product_content.asp?sn=97

I checked (after purchasing of course) that my RAM is not listed in ny MOB manual - could this be a problem? Also, my PSU does not have 24-pin connector (only 20-pin), while MOB connectors are 24 and 4 pin, so I am connecting PSU to MOB through 4 pin connection.

Thanks in advance!!
10 answers Last reply
More about system booting
  1. It could be your PSU
  2. how do you mean? It's new out of the box.
  3. Are you saying the 20-pin socket isn't connected at all?

    If so, get a 24 pin to 20 pin adapter from google.

    Edit: Alternatively, this apparently works, but I can offer no guarantee :( http://i.hwa.me/articles/large/11254.jpg
  4. Thats right, 24-pin socket on MOB is not connected to PSU (it has only 20-pin connector). I dont have a MOB manual with me here but I remeber it saying its not necessary to connect 24-pic socket if 4-pic socket is connected. Are you saying BOTH 4-pic and 24-pin socket have to be connected to PSU?
  5. it certainly is not powering on anytime soon without the large 24 pin connector to mb powering it...that is the mb's main power input from the PSU
  6. Simlply put, 4 pin gives power to processor, 24 pin gives power to everything else.

    Putting a 20 pin cable to a 24 pin socket (to the far right; http://i.hwa.me/articles/large/11254.jpg) lowers the power given to the pci-e slots.

    In other words, your graphics card may not run as well. You can give it a go and see how the card holds up, but if you get any reset problems during gaming, you'll need a new power supply :(
  7. Thanks guys for your help so far, kind of devastating news. Supplier i was buying it from didnt say a word about PSU not working with this motherboard....
  8. Yeah , Well the supplier may not know what works or doesnt work with what. But like othersw have said it is necessary to have all 24 pins populated . Normally that power comes thru the same cable to the 20+4= 24 pin plug ( that combination allows you to use that plug on a 20 OR a 24 pin pluged MB)

    Dont feel bad about making an error as even long time builders can goof up in making a connection ( such as reading where from panel connectors go ) and then end up having to reconfigure something or other.

    Best of luck in sorting this out.
  9. paulus said:
    Thats right, 24-pin socket on MOB is not connected to PSU (it has only 20-pin connector). I dont have a MOB manual with me here but I remeber it saying its not necessary to connect 24-pic socket if 4-pic socket is connected. Are you saying BOTH 4-pic and 24-pin socket have to be connected to PSU?



    Your PS has to be connected to the MB via a 24 pin plug ( cable / plug of ps may be a 20+4 pin plug that can be used on older MB that do not require a 24 pin plug but use the 20 pin) the other major connector is either a 2 pin or an 8 pin plg *** this is a completely diff cable and it provides power elsewhere ( Sometimes the MB has an 8 pin plug but there might be aplastic cover over 4 of those plins to signify that you can use a 4 pin cable plug.

    The manuals can sometimes be a little vague and reading anything into the instructions can spell disaster ** Doubt that you damaged anything so all its PROBABLY gonna take is a look at what you have as far as wiring from PS and try to match up with plugs on MB
  10. Also did you connect power to the video card?
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