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new build pc wont post, flashing LEDS! ;(

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September 14, 2013 7:36:18 AM

hey guys i just finished my pc build today and when i went to power up the pc it runs for a few seconds and then powers off. it then continues to do this a few times and on the 2nd or 3rd time it stays on but there are no beeps and no picture on the monitor.

on closer inspection inside the case i found out that the cpu and dram LED's are both flashing when i first power on after a few seconds it then powers off but after that and on another boot the cpu led stops and the dram led continues, the cpu led then flashes once and the system then powers off. it can stay running such as both will flash and then stop and the system will continue running but nothing happens there is no beeps, display or anything apart from the leds. it will continue running untill i manually press the off button but even then if i turn the psu back on again the system starts up again without pressing the front power button???

im a little scared that im going to have to spend more money fixing this as the cpu, ram and psu were not new and sold as working. the cpu and ram both look fine, the cpu is in next to new condition and the ram is a few months old. the psu i cannot test because the fan only comes on under load and it cannot be jump started.

my specifications.
intel i7 3770k
asus p8z77-v pro board
corsair h100i
kingston hyper x 3k 120gb ssd
16gb corsair vengeance ddr3 ram
corsair 500r case.
corsair TX750W psu.

everything is connected as it should the only thing i could say is i over-tightened one of the standoffs on the tray and it stripped the threads a little so it couldnt be fully tightened down, it was tight but the standoff would just keep spinning(not loosely but it wouldnt full tighten down, the motherboard was screwed in tight into all standoffs.

ssd is connected to sata 3 6gb/s port.

basically if anyone can help me because i have spent a lot of time and money on this build and to have it not running is very sad for me because i feel like it may have all been for nothing. im starting to regret building it myself.

i just dont know what to do really as pc building is very new to me but i do have the experience to build it myself im just a little unsure because im pretty sure that if the cpu or ram was broken they would be a sold LED and not flashing, is this a bios issue or am i mistaken. Im unsure.

i have also tried the memok button but it flashes for a few seconds then the cpu led flashes once and the system powers off, it then retries posting but leds flashing etc and it then powers off it then comes on keeps running but no picture on the monitor.

Thanks guys, ps i can put up a video if needed of the system starting up to help
September 14, 2013 8:03:04 AM

What video card are you using or are you using onboard?
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September 14, 2013 8:05:33 AM

getochkn said:
What video card are you using or are you using onboard?


thanks for the reply, im using the onboard graphics for now as i dont have enough money untill next month to fully complete my system. right now the system is running but there is no signal. after a few boot attempts the cpu and dram both flash once and the pc settles down but there is still no picture. im going to try a new psu to see if thats the problem.

hopefully will be as another psu is much cheaper than a £170 mobo or £250 cpu.
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September 14, 2013 8:10:46 AM

is it a single ram stick or multiple ones? if it's multiple ones try one stick at a time, and try it in multiple slots.
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September 14, 2013 8:17:48 AM

getochkn said:
is it a single ram stick or multiple ones? if it's multiple ones try one stick at a time, and try it in multiple slots.


ive tried with all 4 sticks of ram in each of the slots but nothing works. all at a time or one at a time it doesnt work.

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September 14, 2013 8:56:32 AM

Are you sure your screen cord is plugged all the way in? I thought my computer wasnt working the first couple of days, then I jammed the cord in farther.

You could try updating the bios if you think it will help. Asus boards have a handy usb bios flashback option which just requires a usb with a correctly labeled bios file on it, plugged into the labeled usb port on the board, and a psu, that's it. Here is more info: http://event.asus.com/2012/mb/usb_bios_flashback_guide/

I don't know the exact mechanism behind the beep codes, but I think it's fairly safe to say that if it's flashing and won't stop there is something not quite right.

As far as the standoffs, they should only be finger tight (or if you can't get your fingers there, then just tight enough so that it feels tight, but not much tighter). If you mean the metal dots surrounding the screw holes then I've stripped some of that off too and it was fine. But you don't want to tighten the screw too much.

Do you have a system speaker plugged in? There is no onboard speaker for motherboards made these days so you will need to get one if you havent already.

Are you able to test the ram and/or cpu in another computer? That could rule out problems there. You also might want to check the cpu and socket for broken/bent/scratched pins. I might have recommended getting a new instead of a used cpu but depending on how you got it it might be too late for that now.
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September 14, 2013 9:13:16 AM

mc962 said:
Are you sure your screen cord is plugged all the way in? I thought my computer wasnt working the first couple of days, then I jammed the cord in farther.

You could try updating the bios if you think it will help. Asus boards have a handy usb bios flashback option which just requires a usb with a correctly labeled bios file on it, plugged into the labeled usb port on the board, and a psu, that's it. Here is more info: http://event.asus.com/2012/mb/usb_bios_flashback_guide/

I don't know the exact mechanism behind the beep codes, but I think it's fairly safe to say that if it's flashing and won't stop there is something not quite right.

ive tried putting the cable in further still it does not work. I have also tried all sticks of ram and with no ram at which it beeps with no ram installed.

As far as the standoffs, they should only be finger tight (or if you can't get your fingers there, then just tight enough so that it feels tight, but not much tighter). If you mean the metal dots surrounding the screw holes then I've stripped some of that off too and it was fine. But you don't want to tighten the screw too much.

Do you have a system speaker plugged in? There is no onboard speaker for motherboards made these days so you will need to get one if you havent already.

Are you able to test the ram and/or cpu in another computer? That could rule out problems there. You also might want to check the cpu and socket for broken/bent/scratched pins. I might have recommended getting a new instead of a used cpu but depending on how you got it it might be too late for that now.



it has a microphone installed and it doesnt beep, only when there is no ram then it will beep. it just keeps on flashing back and forth back and forth and powers off. it then powers flashes once on dram and cpu and stays running but no picture what so ever ive tried with pc-vga cable with hdmi cable, but nothing.
the standoffs are not overtight, i overtightened one of them and stripped the threads a little on the actual mounting plate but it was only slightly and it was still tight and the motherboard fitted correctly. the screws are tight in the motherboard also.

i think its proberly the cpu... but i cannot test it so i dont know what to do as it may not be im just totally unsure about what to do.
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September 14, 2013 11:38:55 AM

You could take out the cpu and inspect it, check for bent pins in the socket, scratches on the pins or chip, or any weird looking marks,smudges, etc. You could also reapply your thermal paste and cooler and see if that helps.
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September 14, 2013 12:25:07 PM

mc962 said:
You could take out the cpu and inspect it, check for bent pins in the socket, scratches on the pins or chip, or any weird looking marks,smudges, etc. You could also reapply your thermal paste and cooler and see if that helps.


i want to check everything else first such as psu as i do not have any more thermal paste to put on the cooler itself so i cant test it lol. the cpu looked fine the only thing i noticed was that on a few socket pads what ever they are they were slightly lighter than the rest maybe 2 or 3 of them not scratched or anything but just looked like the previous owner their socket pins hadn't sat central.

the motherboard socket pins were also fine with no bent pins as i gave them a good inspection before installing the cpu.
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September 14, 2013 3:17:22 PM

The paste is cheap for a bottle that can last your a fair number of times.

You could test with a cheap but reliable psu bought at your local electronics shop and then maybe return it later.. or if it isnt too much of a hassle test the psu in another computer. Same thing for the ram (really most any part but the board and case can be tested this way as long as it fits in the other computer, that's just because it doesnt make as much sense to move the board and case to another computer).
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September 15, 2013 1:56:27 AM

mc962 said:
The paste is cheap for a bottle that can last your a fair number of times.

You could test with a cheap but reliable psu bought at your local electronics shop and then maybe return it later.. or if it isnt too much of a hassle test the psu in another computer. Same thing for the ram (really most any part but the board and case can be tested this way as long as it fits in the other computer, that's just because it doesnt make as much sense to move the board and case to another computer).


im going to take my ram to test at my bros and borrow his psu from his old computer to test. i made a video and managed to get some beeps out of it this morning. one short beep followed by one long beep, ill edit this post and post the link in once it is uploaded so you can see it and listen to it.

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