PC won't turn on after shutdown unless i unplug the power strip and wait 30-40 minutes
11 replies, posted
As the title says, my PC won't turn on after a shutdown, and i have to wait 30-40 mins with everything unplugged. Then it works again, and if i turn it off again and try to turn it on the same thing happens again.
It's something that got worse, if i remember well it happened just a single time a year ago after a blackout, and everything worked after that. Two weeks ago there was another blackout, it did this but then i didn't have any problems until yesterday, where it started to do it regularly with normal shutdowns.
Once it turns on, it works as intended without random shutdowns, anything (Atleast for now).
My components:
Mobo: GA-990FXA-UD3
PSU: XFX XTR 650w
Cpu: AMD 8320
GPU: GTX 960
16 gbs ram
Any suggestions on what could it be?
Have you tried another PSU? If you gotta leave it unplugged for 30+mins,it's likely that component that is failing
[QUOTE=Richard Simmons;52916561]Have you tried another PSU? If you gotta leave it unplugged for 30+mins,it's likely that component that is failing[/QUOTE]
I just found out the old 550w PSU that i've replaced with the current one, i'm going to test it this weekend.
Hopefully it's that and not the motherboard, i've read that it could also be a broken capacitor issue.
Still, it'd be kinda ironic considering a year ago i decided to swap the old PSU (which was just a generic brand) with this one which is 80 plus certified, just to be safe considering this build isn't the most stable thanks to that Amd CPU,and now this one might be the culprit.
I don't think it is a motherboard. A PSU worth it's salt should protect the main board from surges. Depending on why the black/brownout occurred, the PSU likely took the brunt of things.
Give us an update on how everything goes with the spare PSU. Hopefully it works out.
80 plus has zero merit on anything quality wise. It just means that the psu meets specific ratios for energy conversion under ideal conditions.
Xfx is usually pretty alright though so idk, probably a lemon if anything, I'd wager on a mobo side issue if the psu isn't at fault, but I'd guess psu first imo.
Hi, engineering student here.
A couple of things we can try to narrow down the problem.
Firstly, do you have to unplug everything? If you unplug everything but the power cable before shutting down the computer, will it power up again right away? If so, a peripheral could be the cause of your issues.
Second if something is wrong with your PSU (sounds like a surge condition, where a MOV is latching and preventing a power on until it's discharged), after shutting down the computer, unplug the power cable from the computer. Locate the power connector on the PSU, it should have three pins. Then take a screw driver, pair of pliers or a paper clip or something like that and short out the pins inside the power connector of the PSU to eachother (in no particular order, just make sure they have all been shorted to eachother). This should be completely safe and should not harm the psu, if you're hesitant then wear insulated gloves while doing this.
Thirdly, after shutting down the computer, leave it plugged in (but turned off) and do a cmos reset (refer to your motherboard manual, or [url]http://lmgtfy.com/?q=cmos+reset[/url]) and see if the computer will start immediately afterwards.
Post results.
[highlight](User was banned for this post ("LMGTFY" - Kiwi))[/highlight]
Stay in engineering dude.
You can't tell a user to open a PSU under any degree unless you want to open yourself to a lawsuit.
[QUOTE=Richard Simmons;52919599]Stay in engineering dude.
You can't tell a user to open a PSU under any degree unless you want to open yourself to a lawsuit.[/QUOTE]
Where did he say to open it?
Update: Just swapped the PSU with my old one, i've done two reboots and it worked fine, so i think you were right.
Luckily i think the broken PSU is still under warranty, so i might be able to ask for a replacement.
[QUOTE=Richard Simmons;52919599]Stay in engineering dude.
You can't tell a user to open a PSU under any degree unless you want to open yourself to a lawsuit.[/QUOTE]
I didn't say to open it, just short the pins of the power connector from the outside.
But, opening computer power supplies isn't even that dangerous. Some (uninformed) people like to claim that the super deadly lethal voltages stored in the mains filter capacitors will kill you dead if you touch them. This simply isn't true. With at most 1mF of capacitance at a couple of hundred volts, you're talking less than 10 joules of energy. Unless those 10 joules are coupled directly to your heart, they have to go through your skin resistance (at several hundred thousand Ohms) which means you'll be subjecting yourself to a couple of milliamps, for a fraction of a second.
Mains voltage can be lethal, absolutely, but by nature a capacitor will discharge and stop being at that potentially lethal voltage.
Which is all a fancy way of saying that, if you touch the terminals of the big caps in a computer PSU, you'll get a small shock, which might hurt a bit.
I know because I've done this, on accident, many many times.
Assuming of course that you unplugged it first, but even then AC doesn't cause muscle cramps like DC does so you would just get shocked, and then move your hand away.
[editline]25th November 2017[/editline]
[QUOTE=Batandy;52919737]Update: Just swapped the PSU with my old one, i've done two reboots and it worked fine, so i think you were right.
Luckily i think the broken PSU is still under warranty, so i might be able to ask for a replacement.[/QUOTE]
Hey, that's wonderful.
[QUOTE=chipset;52922362]But, opening computer power supplies isn't even that dangerous. Some (uninformed) people like to claim that the super deadly lethal voltages stored in the mains filter capacitors will kill you dead if you touch them. This simply isn't true. With at most 1mF of capacitance at a couple of hundred volts, you're talking less than 10 joules of energy. Unless those 10 joules are coupled directly to your heart, they have to go through your skin resistance (at several hundred thousand Ohms) which means you'll be subjecting yourself to a couple of milliamps, for a fraction of a second.[/QUOTE]
I'm afraid you've been misinformed as well, your average ATX power supply capacitor can deliver a [url=http://www.kctv5.com/story/19767067/teen-electrocuted-while]lethal shock[/url], granted the risk is low particularly if you're already taking precautions.
Skin resistance isn't a static value, as soon as you get shocked with a high enough voltage it's going to start to break down the skin and with ~50J of energy behind the average ATX capacitor it will never discharge in time to save you, depending on skin condition, contact area and normal physiological variation a current of tens to hundreds of mA is entirely possible. and from my own experience isn't difficult to achieve.
The reason why so few people die from it is simply down to the fact the heart is quite resistant to DC shocks, that and you have to get the current through the chest, however there is a small window in the normal heart rhythm where a DC shock or physical trauma will cause immediate and typically fatal fibrillation as is the cause of many [url=https://en.wikipedia.org/wiki/Commotio_cordis]sports deaths[/url] where impact to the chest has occurred, so you're pretty much playing Russian roulette when it comes to DC shocks.
AC on the other hand is significantly more dangerous since not only can it directly cause fibrillation you have the added current due to the human body capacitance which is effectively parallel to your skin resistance so it's much easier for current to penetrate and ultimately break down your skin, also while it may not cause muscle locking like DC the disruption can still be significant enough that you can't let go, most notably in cases where you have gripped the conductor in the palm of your hand.
Hey, second engineering student (computer engineering) here and I vote with Chryseus on this one. Don't open your psu, also only the careless get shocked regularly, it's something we strive to avoid as much as possible even when working in low voltage applications where the largest risk is killing electronics before ones self. Indication of bad practice honestly, if not extremely bad luck. I personally have only been shocked a small handful of times, usually due to either someone else's fault or me doing something very wrong in the early freshman days.
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