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System not booting

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January 7, 2011 6:27:18 AM

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-s...

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=N82E168...

MOB: ASUS P7P55D-E LX LGA
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PSU: FSP Group FSP650-80GHN
http://wellcom.co.il/catalog/product_info.php?products_...

Video card: GIGABYTE GV-N450OC-1GI GeForce GTS 450
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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!!


More about : system booting

a b B Homebuilt system
January 7, 2011 8:19:29 AM

It could be your PSU
January 7, 2011 8:32:17 AM

how do you mean? It's new out of the box.
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Anonymous
a b B Homebuilt system
January 7, 2011 8:34:05 AM

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
January 7, 2011 9:03:39 AM

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?
a b B Homebuilt system
January 7, 2011 9:15:57 AM

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
Anonymous
a b B Homebuilt system
January 7, 2011 9:46:57 AM

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 :( 
January 7, 2011 10:10:28 AM

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....
January 7, 2011 10:24:18 AM

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.
January 7, 2011 10:32:50 AM

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
a b B Homebuilt system
January 7, 2011 3:45:17 PM

Also did you connect power to the video card?
!