Computer power up but wont boot! Help Please

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ixbundy

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Hi, today i switched on my PC and it instantly cut off and i could smell like a burning smell as if a component burnt out. I took side panel off case and discovered the smell was coming from my PSU.

I then powered everything off at wall etc, left it 10 mins and tried to power up again. Everything powered up ... Case fans, gpu fans, cpu cooler, hdd etc but the PC does not boot or even give me any error codes off mobo speaker, just silence.

I have tried removing all parts and inspected them no visual damage. I tried resetting CMOS and installing parts one at a time and repeating boot cycle but still nothing. Its just powers up and does not post.

My full PC specs are as follows;

ASUS ROG Crosshair V Formula Motherboard
AMD FX-8350 @ 4GHz with Antec Kuler 950 CPU cooler
2 x 4GB Patriot Viper 1600MHz RAM
MSI Radeon R9 290 4GB graphics card
2TB HDD
Seasonic M12II 620W PSU
Zalman Z11 Plus Mid Case

Might it be the PSU even though the PC powers up or could it be a bigger problem? PLEASE HELP!
 
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ixbundy

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I have tried removing one part at a time and even with no RAM, GPU it still does not give a beep code. The burning smell which come from the PSU would suggest that maybe something inside the PSU got fried and this is the culprit however would the system still power up?

I would like to think it is not the Mobo or CPU at fault as these are both less than 4 months old.

 
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Moonstick2

Moonstick2

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Close to 100% that the PSU has gone.

Power supply to the system goes through stages. First stage the PSU provides power to the fans and disks, but POST is the second stage and the motherboard won't POST until it receives a signal from the PSU telling it that the supply voltages are all satisfactory etc. Sounds like your PSU isn't giving this signal, most likely due to whatever went pop.

You need a new PSU. It's a quality one, but was it old? The worry would be if something else caused it to blow, but to be honest until you put in another PSU you're not going to know.

Found the article I was thinking of - the motherboard is most likely waiting for the 'Power Good' signal and not getting it.
 
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ixbundy

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@Moonstick

Thanks for your reply. The PSU is also pretty new everything in my build was purchased around 4 months ago bar the GPU. I originally built the system with a R9 270x GPU which i upgraded a couple weeks ago to the R9 290.

It does state on the MSI website the recommened wattage for the R9 290 to be 750W however i did a research and thought a good quality 600W+ PSU like mine would still be okay running my system on stock speeds. The computer did run fine for a couple weeks with the R9 290 installed with no blue screens or crashes etc.

Maybe this could be linked with problem in my PSU?

I have ordered a new EVGA SuperNova 850W Gold Rated PSU to future proof my setup and fingers crossed it is not a bigger problem like my mobo/cpu causing the system to not boot.
 
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Moonstick2

Moonstick2

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I've been running an R9 290 on a 550W supply for about six months now and with no issues, though with a less power-hungry CPU. As you probably found during your research, the 750W recommendation is more likely trying to account for the cheap PSUs out there than any real requirement - I'm not sure I've ever seen a measurement showing much more than 400W total system power draw at the wall, and decent power supplies can normally cope with up to 10% over their rated wattage (that being headroom - I'm not saying it's okay to buy a 500W PSU for a system that is expected to use 550W).

No company, no matter how good, can ensure it never produces a dud unit. If your PSU was that new I'd be inclined to RMA it as faulty. You're outside the window though for insisting on your money back, but I guess you could always sell a replacement to mitigate your losses.
 
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Chinswag

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This happened to me. Get a new PSU and one with a large wattage. Whats happening most probably is that your parts are putting too much stress on the PSU and so you need a larger wattage so that your PSU has breathing space. Get it sorted ASAP so you don't melt anything!
 
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Moonstick2

Moonstick2

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I seriously doubt that his/her system was pulling more power than the Seasonic could handle, unless something was wrong or there was an overclock we've not been told about.

A video's worth a thousand words. That system's showing 660W drawn from the wall, so even allowing 90% efficiency for an 80+ Platinum at full load that means 594W to the system at the worst - and that's with two R9 290s in CrossFire. Take one out and even with an Athlon FX8350 included, you'd expect the draw from the PSU to be what, 100, 150W less? Well within the capabilities of the Seasonic 620W.
 
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ixbundy

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There was no overclock on the CPU this was running at stock speeds (4GHz) The R9 290 i hade a slight overclock on of 1100MHz Core and 1300MHz Memory but this was with stock voltage. I just bumped the the power to +50 via MSI Afterburner.

If you new PSU fixes my problem i will RMA the PSU and do as you advised just sell the new one and put it towards the cost of my replacement so im not £100 out of pocket.

 
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ixbundy

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*UPDATE*

Tried with the new EVGA 850W PSU .... Still nothing. Same problem, the computer powers up all fans spin, lights come on but no boot, no error code!

I am lost with ideas now does this mean its the motherboard/cpu now?
 
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Moonstick2

Moonstick2

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Sorry, but with no POST (assuming there's a PC speaker connected to the motherboard) it sounds like the motherboard is dead. Try booting with no RAM, video card, diskdrives etc (keep the CPU in) and see if you get any POST error codes then.

Question is whether the Seasonic PSU blew and took the motherboard with it, or the other way around. I'd be inclined towards it being the motherboard failed somehow and took the PSU out.

Are you absolutely sure the smell was coming from the PSU? You can't see anything damaged on the motherboard (there are a lot of components, it can be easy to miss something)? Have you opened up the PSU (disconnected from everything obviously, not an issue now since you've taken it out) and spotted what blew? It's not beyond the bounds of possibility that the Seasonic PSU is fine and you were mistaken in thinking the smell was coming from it.

You'll need to RMA the motherboard, see how rapidly the supplier can get a replacement to you.
 
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ixbundy

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Yes the smell definitely come from the PSU i have inspected the motherboard and no visual signs of damage at all. The last step for me to try is to breadboard the motherboard leaving only the CPU, CPU Fan, Mobo Speaker and PSU connected.

If this still gives no post error beep codes then its safe to say the motherboard is done for? The DRAM LED on my motherboard also is a solid red when attemptong to boot but even with no RAM installed still i get no beep code which rules out bad RAM stick.
 
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Moonstick2

Moonstick2

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Well, on the RoG forum this appears to be a common issue, fans on, solid red LED, no POST.

Breadboard it, check the power connections are sound, and if still no joy then RMA it. If you bought all the bits from the same supplier, I'd be inclined to see what they would also do about the probability that it took the PSU with it as well.

 
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