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Help!!! Pc is suddenly not responding - no power-on, no fans, no post, nothing :(

post #1 of 10
Thread Starter 
So my PC was working perfectly this morning, it's about 20 months old, except for the case, GPU, cpu-cooler, and HDD upgrades, and has consistently been overclocked at various levels and unlocked for perhaps 75% of the total time.

I was fiddling with my overclock again this morning on the suggestion that I could get my CPU NB a little higher and because I've been trying to get the most out of my RAM.


My last settings were ( I think):
260 bus/ref-clock/fsb
(x14 CPU = 3640 @ 1.525v, was test-stable)
(x11 NB = 2600 @ 1.45v, was test-stable)
(5.33 RAM = 1385mhz 6-7-6-24 @ 1.95v, was test-stable)
1.3v NB
All other settings standard
*Test-stable is the short term stability testing whilst finding OC levels - I've done 12 hour runs @ similar speeds before, so was just doing 20-mins Prime Small FFT and 40mins Blend to get general stability at these ranges.
Max CPU temp in HWMonitor was 61degreesC
(core temps weren't showing due to unlock bug, but are on average 7 degrees lower than CPU temp)
My previous working settings are in my sig-rig, and were stress-tested stable for 12 hours plus.
continuing ...


All was going well and I achieved my objectives. I decided to back in down just a little so I reset but I accidentally missed the bios-entry point where you press delete and the PC began booting.

I pressed the reset button and the PC reset, but it was on though not booting-up - the fans were spinning, as were the HDD's, and all LED's were on. This has happened before in the process of overclocking, usually requiring me removing the PSU power cable for about a minute then plugging it back in, after which the BIOS would have reverted to the back-up bios (LOVE Gigabyte MB's for their dual-bios system) and all would normally be well; I would reset my overclock settings and continue on my merry way.

Not this time. I unplugged the PSU after powering down, as per usual, waited my 60 seconds, plugged back in and this time nothing. The power button made no effect whatsoever. No fans. No LED's. No HDD's. Nothing.

Puzzled, I removed the psu cable again and removed the CMOS battery for 60+seconds, again, no response at all (no fans, nothing). So I repeated the procedure but for about an hour this time. Still nothing.

I switched the case power button cable with the reset button cable (where they plug into the motherboard), to check if the power button had broken (NZXT case button "feels" ever so slightly fragile), still nothing. I've had the PC unplugged and with the CMOS battery removed for a 4 hour stint now, and just tried it a minute ago - nothing.

I'm freaked out now. This hasn't happened before.

Help me trouble shoot - give me suggestions as to what went wrong.

PLEASE NO NOOBS - I probably know more than at least half of you, I don't want your random, assumptive, uneducated rhetorical conjecture. Only experienced PC builders need comment. I need serious help. I've got no PC building support network here, I just moved to London, so I can't just borrow a friends PSU and try it, etc. I'm also broke, so if I can fix it myself, I MUST.

I also, seeing as I just moved, don't have any tool kits or anything. I have a multi-tool screwdriver. That's it. No soldering iron. No multi-meter. Nothing. My room mate might have a multimeter I can borrow to test the PSU out. I don't have any motherboard jumpers either, but I can short fuse with some wire or a flathead screwdriver tip if need be. I've never tested a PSU this way before, but I'm sure i can do it with some guidance.

+ Rep for ALL legitimate help. Thanks in advance.
Edited by willibj - 8/8/11 at 4:42pm
 
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PortaPuter
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post #2 of 10
ok now dont take offence-You probably know more than me.
you have tried a different wall outlet for getting power from?
asuming your monitor is powered from the same double plug at the wall or whatever,does that light up?

to test your psu though:
Pull off the main 20/24 pin motherboard power connector then using a small wire or a paper clip connect the green wire with one of the black wires on the 20/24 pin plug,
the psu should fire up and the fan will spin up, if not then the psu is dead.
when you do this test there needs to be at least one hdd/DVD drive is connected to the psu since most psu's have minimum load requirements to run.

some PSUs have a rocker switch on the back that cuts the power, be sure to check that out too,
I've been guilty of thinking the pc was dead when that switch was off....
Edited by MightyMission - 8/8/11 at 4:46pm
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post #3 of 10
have you been able to power up the power supply using the jumper pin technique?, if it doesnt power up, id say the power supply is dead, and from what your describing id say so.

EDIT: also, if it turns out the power supply is dead, and the power supply is out of warranty, open it up and check if the fuse inside has burnt out, its happened to a friend of mine when he plugged the power cable back into the wall.
Edited by donthaveacow - 8/8/11 at 4:51pm
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Shironeko
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post #4 of 10
Does the power have a 120/240 switch? Maybe that got flipped accidentally.
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post #5 of 10
Use the power supply jumper technique, if the PSU works, then the Mobo probably isnt completing the circuit for the PSU to turn on. Sounds like the PSU is dead if even the fans cant run...
post #6 of 10
Thread Starter 
All good suggestions.

I've tried the PSU with the power cable from my working monitor and no avail. The PSU is switched on at the back (tried both just in case).

There is no 120/140v switch, the Antec TPN have internal voltage regulation switching, and the PC has been working in the UK for a week now.

I've not "jumped" the PSU yet by the method described - this is where my knowledge is lacking and I'll need help. I haven't tried yet because I wasn't sure if I had to unplug everything in my PC from the PSU first, and its all connected with the wires routed, so it's a decent sized job.

So should I unplug the 8-pin CPU, GPU, HDD's, DVDRW, case fans or any combination of them before trying?
 
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post #7 of 10
yes that is best. And also, you can find plenty of videos and pictures as to how to perform the technique
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post #8 of 10
unplug everything except a dvd drive,so the psu has some form of load.
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post #9 of 10
I know youve tried the unplug and remove CMOS battery, however, when you did that, did you push and hold the power button on your computer?
Reason being is that the capacitors can hold power for quite a long time. By pushing and holding the button, you drain the caps.

Another thing you could try is putting the CMOS battery in backwards. This resets everything to its factory settings. However check with GB first to make sure that is an approved procedure. I did this on an Asus board. Its an approved provedure for their boards.
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post #10 of 10
Quote:
Originally Posted by MightyMission;14512890 
unplug everything except a dvd drive,so the psu has some form of load.

if you talking load, then you would need a lot more, atleast 50W, dvd drives barely provide any load while burning dics. So running a dvd drive that is doing nothing with no disc being run will literally draw no wattage.

should you decide to do it without any load, do it for a couple of seconds, that wont damage the power supply.
Edited by donthaveacow - 8/8/11 at 5:13pm
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Shironeko
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