External build worked, but internal did not. Please help!

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dawgg

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Jul 6, 2013
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10,540
Ok so I am in the process of buildig my first computer,and i did my external build which worked, it went to the bios. Then i switched off the psu and put everything in the case, and pushed the button on the case. The fans moved for a split second then stopped. That was the only sign of life. I thought it was a bad button so i bridged the two pins, and it still didn't work. I'm thinking it can't be the cpu,graphics card, or the ram because my external build was succesful so what's happening?

edit: sorry for not putting the parts list:

PCPartPicker part list: http://pcpartpicker.com/p/1k1Mf
Price breakdown by merchant: http://pcpartpicker.com/p/1k1Mf/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1k1Mf/benchmarks/

CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.99 @ Amazon)
Motherboard: ASRock FM2A55M-DGS Micro ATX FM2 Motherboard ($49.99 @ Amazon)
Memory: Corsair Vengeance 4GB (1 x 4GB) DDR3-1600 Memory ($39.99 @ NCIX US)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: MSI Radeon HD 7770 GHz Edition 1GB Video Card ($84.99 @ Newegg)
Case: Sentey GS-6000 II Optimus (Black) ATX Mid Tower Case ($82.98 @ Newegg)
Power Supply: Corsair Builder 430W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Amazon)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Keyboard: Logitech K120 Wired Standard Keyboard ($11.11 @ Amazon)
Mouse: Cobra 9897005984104 Wired Optical Mouse ($13.99 @ Newegg)
Total: $567.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-13 00:54 EDT-0400)
 
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Standoffs is definitely my first thought, too. Re-examine those carefully, and not just the count. There should be a standoff mounted exactly where the is a hole for it in the mobo. There should NEVER be any standoff where there is no matching mobo hole. The mobo is designed to be grounded to the case at each hole by contact of the screw into the standoff, but nowhere else.

You've already anticipated my second suggestion - the cover plate on the back of the mobo. I once caught an error while assembling. Looking closely at that plate from the back after it was all installed, I found that one of the cover plates' little springy fingers, intended to press against the outside of a connector body from the mobo, actually was sticking down...
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dawgg

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Jul 6, 2013
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10,540
There wasn't a standoff in the wrong place, i put 6 standoffs and there's 6 holes in the motherboard, also i have tried shorting the pin instead of the power button-no success. Re-did the external build which was SUCCESSFUL, but put back in to case, unsuccesful. Thought it was the mobo i/o panel shorting it so i took it out still no success. Took the psu out of the case and tried, still didn't work.

I also want to point out that my mouse led light lights up, i don't think there's any lights on the mobo or gpu to tell me if it's getting anything, but when i short the pins and/or press the power buttons the fans barely move, then stop.

At this point i'm pulling my hair out because i know that the parts must be working since the external build worked twice. i'm just doing something wrong. :mad:
 
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Paperdoc

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Oct 19, 2006
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Standoffs is definitely my first thought, too. Re-examine those carefully, and not just the count. There should be a standoff mounted exactly where the is a hole for it in the mobo. There should NEVER be any standoff where there is no matching mobo hole. The mobo is designed to be grounded to the case at each hole by contact of the screw into the standoff, but nowhere else.

You've already anticipated my second suggestion - the cover plate on the back of the mobo. I once caught an error while assembling. Looking closely at that plate from the back after it was all installed, I found that one of the cover plates' little springy fingers, intended to press against the outside of a connector body from the mobo, actually was sticking down inside the connector and touching a pin. I had to remove and re-position parts to correct that.

My third suggestion comes from my not understanding clearly your external assembly. You talk about a bare-bones assembly outside that works, but do not tell us whether you then installed ALL your devices and boards in the external trials and verified that the FULL system works. If you did not, maybe the reason it does not work inside the case is that some peripheral is faulty. You can do an inside-the-case sequence like an external one. You install inside the case only the bare-bones components and fire them up. If it works, you shut down and add a component, than fire up again. Keep on going until it all works OR one new component causes trouble.

Fourth suggestion has to do with the CPU fan. On some systems, if the speed signal from the CPU cooling fan does not get back to the mobo, the mobo BIOS interprets that to mean that the fan has failed. Then it will not wait for the CPU to overheat - it will just shut it down right away. So, if you do NOT run your CPU fan off the mobo CPU_FAN port this could happen (and there's a way around this for people who want to cool their CPU this way). ALSO, if you are using the mobo CPU_FAN port, but the connection is poor (for pin 3, the speed signal line), the signal may not get to the mobo. Check that this connection is secure.
 
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