MoBo doesn't give power to CPU

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John Giulivo

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May 24, 2014
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Hi, I've been reading this forum for quite a while, lots of issues solved thanks to advices I've seen her...now it's my turn to ask (maybe cry) for help...

I have an AMD APU A8-3870k on a Asrock A55m-HVS...I wanted to upgrade my Mobo to an A75 (Hudson D3 chipset) keeping the cpu...well there's when the nightmare started.

First I bought a Gigabyte GA-A75-UD4H (used) ...put everything together and it powers up just plugging the psu (w/o case power button conected)...stay on for 3 or 4 secs and then goes off. Reading this forum i've fond out there's a short circuit somewhere, try to take it to a local technical service a no luck...

Then I bought a "brand new" Asrock A75 Pro4-m from a recognized website. I'm outside the US, so it took 4 weeks to arrive (not a supplier issue). A really nice sealed package with a mobo without sata cables, no i/o backplate, and just when I tought couldn't be worst, traces of thermal paste on the cpu socket and Missing cpu fan holder...I couldn't return it because it's too expensive for me, so i've got a 25% refund...I was able to put the fan holder of the gigabyte mobo on the asrock, and the thing came with the very first BIOS version according to the label on the chipset ( does not support the A8-3870 I have)....I bought an older fm1 cpu just to upgrade bios, but, guess what...the cpu fan works, but no beep, no POST, no video...cpu doesn't get hot so I assume it's not getting power...No technical service dares to work with it...

I know this is really long but if you could help with either mobo, i would really appreciate...I'm ready to set everything on fire and use it for a bbq

Parts I have (besides mobos):
cpu A8-3870k
cpu A6-3500
2x4 gb Corsair vengeance
XFX 750w PSU
gigabyte R9-270 2gb DDR5


thanks in advance
John
 
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M
I really don't have much advice but cpu not getting hot doesn't mean theres no power to cpu. it just means cpu load is low or nonexistence.

that being said with traces of thermal paste id really make sure that's not shorting out two pins(it wouldn't take much at all) which would stop the post from completing (realize post has to turn everything on the cpu/ chipset/ and rest of board and it doesn't turn on light a light but is more like going room to room of a 100 story building and turning on lights room by room) it takes hundreds of thougnds of cycles just to do that(even though it takes less then 1 sec) and if two data pins are shorted slightly its unable to turn on all the lights.

honestly go though this and do the breadboard...
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maxwellmelon

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Oct 2, 2013
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I really don't have much advice but cpu not getting hot doesn't mean theres no power to cpu. it just means cpu load is low or nonexistence.

that being said with traces of thermal paste id really make sure that's not shorting out two pins(it wouldn't take much at all) which would stop the post from completing (realize post has to turn everything on the cpu/ chipset/ and rest of board and it doesn't turn on light a light but is more like going room to room of a 100 story building and turning on lights room by room) it takes hundreds of thougnds of cycles just to do that(even though it takes less then 1 sec) and if two data pins are shorted slightly its unable to turn on all the lights.

honestly go though this and do the breadboard part for sure. http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems

mabe it will give light into more of whats going on where we can help you better
 
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