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Brand new computer wont start


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#1
brathus

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I just got a new computer and put it together yesterday and when i try to start it up it wont start. The fans spin a little and i see a light go on for a split seccond then it all just dies out. Any help would be appreciated

Here are the specs for my computer.

HD 1T|WD 7K 64M SATAIII WD1002FAEX
MEM 4Gx2|KST KHX1600C9D3K2/8GX RT
PSU TT | W0070RUC 430W RTL
VGA GIGABYTE|GV-N450OC-1GI RT
MB ASUS M4A78T-E AM3 790GX/SB750 RT
CPU AMD|PH II X4 955 3.2G AM3 RT
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#2
phillpower2

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I notice your MB has onboard video, try removing the add on video card and power up and see if that makes a difference, the GIGABYTE|GV-N450OC-1GI RT requires a minimum 400W PSU which only leaves 30W for the rest of the system, does the cards user manual state how many amps are required across the +12V rails?.
Best couple of suggestions I can make would be first remove the MB and do a bare bones set-up on a piece of cardboard (make sure it is larger than the MB) only connect the PSU, the GFX and only insert 1 stick of Ram.
You will then need to short out the 2 power on pins on the MB header to get the PSU to activate, you can use a small flat bladed screwdriver or a paper clip bent into a U shape, this is perfectly safe if you do not touch anything else, the idea is to see if we can get a BIOS screen if you do you can then add one component at a time until you find the problem component, you must power down and remove the power cord from the wall before adding a component, second suggestion try a known working PSU, it is not unknown for new components to be bad, third suggestion try and loan an ordinary PCI graphics card (not pci-e) again to try and get a BIOS screen.
Other things worth checking include, if you used stand offs beneath the MB are they in the correct locations (only where there is a screw hole in the MB) otherwise the MB will short out, check for stray screws or bared wires for the same reason, make sure the jumper cap that can be used for clearing the CMOS is not missing or on the wrong pins and finally make sure the CPU fan is connected to the header on the MB and that the 4 pin 12V ATX connection plugged in securely (see .j.peg).
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#3
brathus

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Well i just double checked that all the power supply's are plugged in right, can it be that i have lots of fans? I have 4 fans not including the cpu fan and the 2 on the video card.

Also you think the problem is that theres not enough power for the whole computer?

I might just have a computer specialist come over today, i'm sick of not being able to use my brand new computer, i toyed with it for hours and hours testing things but nothing seems to give a positive result. I noticed that if i toy with the power cable from the case that the fans spin a little more and light stays on a little longer but i think that its just rapidly sending a signal and causing it to start over and over, and probably not good for it.

Any other advice?

EDIT: I just checked the power supply and it says 430 watts, so should i get a new power supply? Would that fix my problems probably I bought this computer to be a really good gaming computer and all the parts are the parts i specifically chose for the job. And the video card manual says its recommended for a 600+ Watt power supply

Edited by brathus, 05 March 2011 - 01:14 PM.

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#4
phillpower2

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Also you think the problem is that theres not enough power for the whole computer?

Possibly, that is why removing the add on video card and using the MBs vga port needs to be checked out 1st.
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#5
brathus

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And the video card manual says its recommended for a 600+ Watt power supply. Im pretty sure thats the problem.
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#6
phillpower2

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And the video card manual says its recommended for a 600+ Watt power supply. Im pretty sure thats the problem.

600W is required for the SLI mode (running 2 cards side by side).
Have you tried removing the add on card and using the onboard video?
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#7
brathus

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Well theres a reason why i wanted a powerful video card, i need to be able to run certain programs. How would i be able to use the video card i have now and disable the onboard video on the MB
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#8
phillpower2

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How would i be able to use the video card i have now and disable the onboard video on the MB

When an add on card is fitted it normally overrides the onboard video chip so disabling it should not
be required, this is unless the option has been changed in the BIOS.
I am suggesting you temporarily remove the add on video card and use the onboard graphics purely to see
if you get a display, if you do get a display it narrows the issue down to either the add on video card
or an underpowered PSU.
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#9
brathus

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It still wont start even after i take out the video card, and when i toy with the connections to the motherboard to the case i can see the green led light on the MB go on for a second or two, but i have to hold it, does that mean theres a problem with the connections from the case to the MB? I triple checked the manual to see if any were wrong but they were not. What should i do now?
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#10
rshaffer61

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Disconnect everything from the Motherboard except
  • keyboard
  • mouse
  • video output
  • 20+4 powercable
  • 4/8 pin 12v wire both coming from the powersupply,
  • Cpu fan wire
  • power and reset button to the case
  • case speaker
Now you should have NOTHING connected to the motherboard except what was listed above.

The goal here is just to test the mobo:

If the computer still will not boot up the please remove the motherboard from the computer along with the power supply

place the motherboard on a piece of card board larger than the motherboard,

this will eliminate a short from the mobo to the case which could be a possibility

Install the cpu with, 1 stick ram in dimm 1, power supply, case switch and case speaker
Connect ps2 mouse and keyboard along with the monitor
Repeat the above and power on
If the computer now boots into bios you most likely had a case short so make sure when installing the motherboard in the case that you use standoffs,
and they line up with the mounting holes in the motherboard and none of the standoffs touch anything else on the underside of the board.


Thanks to Cbarnard for these instructions
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#11
brathus

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Would it matter if i used these type of screws
My link
Instead of these type?
My link
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#12
rshaffer61

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2nd link is the actual standoffs that are suppose to be under the motherboard in the metal plate. The screws go thru the motherboard into the standoffs.
Looks like to me you are shorting the board.
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#13
rshaffer61

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Are you still having problems with your issue?
It has been 14 days since your last response and I was wondering if the issue has been resolved?
If so can you explain how it was resolved so others may be able to fix it if they have the same issue.
If not please let us know and we can continue with helping you to resolve the issue.
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