PSU blew (I think) replaced it, still not working?

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shauncox2013

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Dec 14, 2016
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1,510
Recently I was gaming when my PC just black screened, turned off and wouldn't power back on. I got it to power the fans twice afterwards but it cut off after a few seconds and I cant get it to power on again at all now. Replaced the PSU as it was a few years old and quite cheap but it hasn't solved the problem, The motherboard light comes on but it wont power at all, Ive tried just using 1 stick of ram, clearing cmos, removing anything not needed (GPU, hard drive, disk drive etc), taking out the power switch from the case and attempting to power from the power pins with a screw driver.

I'm really just looking for advice on what the most likely solution is or anything else to try, I don't really have spare parts to test and at the moment can just about afford to replace the motherboard (hoping that's just the problem) and don't want to throw cash at another AMD motherboard if the CPU has gone or both as i could just buy an Intel one for a spare I5 processor I have assuming it hasn't fried everything else of course.

If it helps i can post my specs, thanks in advance for any help.

Edit: I should have mentioned my cpu has been running at high temps recently (usually around 40/50 idle and 60/70 when gaming) I assumed I needed fresh thermal paste, not sure if the cpu could have blown from the high temps?
 
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The specs could be useful in a situation like this, but more than likely the motherboard is dead, but it could have also taken down other components as well. RMA or replace the board first though, if that does not clear it up the CPU would be next. It's unlikely to have made it further than that. I would simply move to the i5, if it's a 3570 (or 3670 don't remember that far back) or newer you would get better performance out it anyway.
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Xibyth

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Mar 22, 2014
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The specs could be useful in a situation like this, but more than likely the motherboard is dead, but it could have also taken down other components as well. RMA or replace the board first though, if that does not clear it up the CPU would be next. It's unlikely to have made it further than that. I would simply move to the i5, if it's a 3570 (or 3670 don't remember that far back) or newer you would get better performance out it anyway.
 
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shauncox2013

Commendable
Dec 14, 2016
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1,510
Thanks for the reply,

I will try to give as much detail with specs but don't have boxes etc to hand -
old PSU - Alpine 700w new PSU - XFX XT 600
ASUS M5A78L-M/USB3 motherboard
AMD 8350 Black edition eight core 4ghz
1x8gb Fury Hyperx RAM
1x2gb Corsair vengeance RAM
1x EVGA GTX750TI 2GB graphics card
Zalman Heatsink

I assum the HD and diskdrive are irrelevant as Ive tried without them connected.

Let me know if you need more info.

Oh and the spare processor i have is an I5-4570 3.2ghz.

I think I'm going to just have to try a new motherboard, I'm just delaying as i know if its not I wont have the extra money for the new Intel motherboard for my spare processor or ram whatever has gone.

 
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Xibyth

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Mar 22, 2014
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Unfortunately there are several factors to consider when it comes to performance of a CPU, I'll try to break it down.

IPC (instructions per clock) is pretty self explanitory
Node size (how large the actual CPU die is
Transistor size and count
Cache amount and speed
clock speed
number of cores/threads

In this the 8350 does have double the cores, but the same amount of threads (thats really an oversimplified explanation) it can work on 8 things at once but it can only answer 4 requests at a time, and not as quickly as the 4570. In some games that support 8 threads such as Crysis 3 the 8350 can pull ahead for a short time, but you will notice a lot more frame dips and lower responses rates as a result of how rendering calls work. So in raw data such as average framerate at fixed moments it may appear to come out ahead in games it is misleading.

http://cpu.userbenchmark.com/Compare/Intel-Core-i5-4570-vs-AMD-FX-8350/2770vs1489

I won't use CPUBoss as they are very well know to be Intel biased and heavily utilize data detrimental to AMD by using detrimental setups and results. UserBenchmark uses a very detailed and comprihensive list of factors to determine results. Given the cost of the CPU's the 4570 lost this one, but since cost is not a factor in your case the 4570 is at it's lowest 10% faster than the 8350, and in many cases up to 30% faster.
 
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shauncox2013

Commendable
Dec 14, 2016
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1,510
Okay thanks for the advice and info, I've already got a motherboard on its way (delivered tomorrow hopefully) for my 8350 I'll post what the issue was when it comes, if it doesn't fix the problem I'll order an Intel motherboard for the i5 and rule out the processor.
 
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shauncox2013

Commendable
Dec 14, 2016
7
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1,510
I've done a lot of research on the PSU for my budget it was a good option, I would have been better off with the ts rather than xt series (if anywhere stocked them) but they're from seasonic and I've read a lot of good reviews from people who have used them.
 
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shauncox2013

Commendable
Dec 14, 2016
7
0
1,510
Thanks for all the help everyone it was the motherboard, the replacement came today and worked no issues now. If anyone looks here again with a similar problem and they can get the fans to spin by taking out the cpu power cable on the motherboard like I could then it more than likely is a dead motherboard, Ive read a few articles where this was the case and the problem for them was also a dead motherboard.
 
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