A88X-G45 Gaming Motherboard (newly installed as an upgrade) gets power but PC will not turn on. I'm stumped and would appreciate some help, please. :

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I've recently bought a used A88X-G45 Gaming Motherboard (MoBo) from eBay that the seller indicated had tested OK and booted up. I can't get the PC to power on after the physical upgrade process was completed--and I cannot figure out why! Please help if you can. :)

The goal was to do a budget-friendly upgrade to my existing PC, as I wanted more Memory than was possible to install in the old MoBo. The A88X-G45 was selected because it had 4 memory slots, two more than the original one had and the price was within my budget. While I tried to reuse the APU, it was accidentally damaged in the removal process. I bought another compatible APU that was new in box and installed this evening.

I replaced a smaller MSI MoBo that came with the PC case being reused for this upgrade. I've followed the manual closely on all connections and have checked them a few times before posting this. I believe that all of them are seated firmly and correctly configured.

When power is connected and the case power button is pressed, the HDD LED briefly flickers, but nothing else happens. When pressing the power button on the MoBo, the APU heat sink fan rotates twice and nothing else happens.
I am stumped as to why this isn't working and would really appreciate any suggestions about how to get the PC to power on.

The MoBo is confirmed as getting power after the cable is connected to an outlet. The power switch and OC Genie on the MoBo light up, along with a red LED in the upper right corner of the MoBo. There are no markings to indicate what this is or why it lights up and stays lit when the PSU is getting power so any suggestions as to what this indicates would be most welcome and appreciated. :)

* Other Tech specs about this PC.
* 8 GB DDR 3 Memory X4 (32 GB total RAM. All 4 sticks are new and bought within the past month)
* AMD A8 7470K APU (just purchased--unopened box--installed this evening for the first time)
* MSI GEForce 1050 TX GPU (Purchased 1 month ago)
* 7200 RPM HDD (original HDD, works great, roughly 4 years old)
* PSU: Epower 400pm (400 Watt total power, bought 6 months ago).

Excepting 2 of the RAM sticks, all other Hardware worked well with the original MoBo. I did need to add extension cables for the PSU to reach the connector on the MoBo as they were a bit too short to reach it. The only cable that can connect to the port on the MoBo has four pins, so it only connects to half of it. From what I understand, the PSU is more than sufficient to meet the relevant power requirements of 242 Watts that it seems this PC needs to power on.

I have attempted the troubleshooting steps I could find in the few relevant questions other users have posted without success. While providing Tech Support has long been part of my job, I'll admit this challenge has me baffled and unsure what might be at fault for this problem. As such, any suggestions that could help get this PC working would be most welcome. Doubly as it's my main PC and I'd love to make it work again. Thanks in advance to anyone whose willing to try and help me figure this out.
 
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UPDATE: After further research and extensive troubleshooting, I've come to believe the MoBo is defective so I'm going to replace it. I can't delete this Thread, so I'm adding this comment instead.
 

jakub-p2

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I know that I am too late for this thread, I am just a student of electrical engineering, but I bet there is a short/broken trace/missing SMD component somewhere in the power delivery circuit, possibly created while MoBo was being shipped, if you want you could closely inspect your board for scratches or maybe SMD components which are missing (look on the internet how a ripped cap or resistor looks, it's quite hard to notice at first, but doable). Also the PSU for me is too sketchy to use, sometimes they do not have the amount of +12V power which was promised on the label, but replacing it is your call; could it be a problem - maybe.
 
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Hi and thanks for adding your thoughts, as they are still appreciated anyway. Your comment brought to mind that some of the pins had been bent on various MoBo connectors when I opened the bubble wrap. I didn't think much of it at the time as they were readily straightened, however your comments brought this to mind. I suspect you may be onto something and I'm curious to see if your theory is correct. I appreciate you sharing your expertise with me, as your insights are exactly the type of advice I was looking for but unable to find on my own.

As to the PSU, thanks for sharing your opinion about it as well. I've done more research into the model and from what I could discern, it should have been more than sufficient to meet the needs for the MoBo and all installed components. That said, I will bear your comments about it in mind when I get the replacement I've ordered. As I bought it just a few months ago, I'm hoping it can work as I'd like to avoid replacing it so soon if at all possible. It is however quite helpful to have the assessment of someone far more knowledgeable than I am about those types of things. :)

Thanks again, I really appreciate you having taken time to respond to this thread. It's nice to know there are others who are willing to help share their knowledge like this.
 

jakub-p2

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I forgot to mention about APU - if you damaged the green substrate and damaged traces it has quite low chance of working, but a ripped pin (pad on CPU must be intact!) is easy-ish repair - put the ripped pin in the socket or even try without it, some are used as 'reserved' or GND/VCC and are not needed for operation.
PSU theoretically should be able to power everything (judging by eBay listing it has only 24A on 12V line, which means 288W, but again these cheap units hardly ever are able to deliver its rated power so your PC might turn off while its on 100% usage), there should be 4+4pin EPS, try connecting both of them (board should still power on only on 4pin EPS; some listings say it only has P4, some say it has 4+4), but personally I am more worried about its reliability. These cheap units are known to sometimes blow up, mostly just releasing magic smoke and some fireworks, but in extreme cases taking PC components with it. Now you know the risk, do what you think is right.
 
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