Pc in on and off loop

Telmir

Telmir

Telmir

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Joined
30 Nov 2012
Posts
9
I recently upgraded my pc and it was working fine, today I tried to add a USB 3 front panel which plugs in via sata power and then into the USB 3 header on my motherboard. But now the pc won't start, it gets into a loop of turning on and off, the power button won't even stop it unless I hold it then the led next to the bios battery flashes. It turns on for less than a second then off for about 2 or 3. Does anyone have any ideas?

I don't have my tools atm so can't take it apart but I've tried both with and without the now component and I get the same thing.

Components:
I7 4790k
Msi gaming 5 motherboard
Evga 750w power supply
Msi 980ti gold edition
 
Did you make sure the connector was connected to the right header? Which header are you exactly using? Have you already tried a different power connector?
 
Yeah I only have one USB 3 header in the mobo and even when the now component is disconnected I still have the same problem but I may have knocked something so I'll try every plug and I'll always try resetting the bios too. If that doesn't work then I'll try my old psu so if that's the fault.
 
Telmir said:
Mines a fully modular psu too, what did you have to do to sort it? Also it was working fine until I tried to add that new part.
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new boy said:
I imagine he pushed it in properly :)
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Yep, just pushed it in properly after noticing it was not.

Maybe you knocked it/tugged it loose when installing the part. Might not be that at all for you. But it did cause my board to do the same as yours.
 
Armadillo said:
Yep, just pushed it in properly after noticing it was not.

Maybe you knocked it/tugged it loose when installing the part. Might not be that at all for you. But it did cause my board to do the same as yours.
Click to expand...

I'll have a look when I get in then cos the psu cables did get a bit of a tug. Thanks all I'll keep you all posted.
 
OK so I tried the psu in a different pc and it works plus I've taken the gpu out and that does nothing so it looks like there is a problem with the mobo or something is shorting somewhere
 
The PC I recenttly installed a new heatsink into is now having this issue. It came up wtih a "bad overclock" message, although the only setting it said that was wrong was the RAM speed, then it rebooted itself. It hasn't been able to boot since. Just keeps turning itself off and on, the furthest it gets is showing the POST screen but it turns off before I can get to the BIOS. I've tried:

- Resetting CMOS
- Replacing battery
- Changing the RAM
- Changing the CPU
- Changing the PSU
- Booting with no GPU or HDDs

Does the same each time. CPU works in another motherboard so it's not that. Can this be anything but a dead motherboard? There doesn't appear to be many P67/Z68/Z75/Z78 motherboards around any more, even on MM/bay. :(
 
ATIorNvidia said:
tried booting it with the motherboard outside of the case?
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I'll try that tomorrow I haven't had enough time to do that.

And unfortunately my system bearly turns on for 1 second, the fans struggle to even get moving before it turns off again.
 
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If a component is short circuting the system the motherboard will remember and refuse to start. By getting the mobo completly off power you delete this and the mobo will start again but please be aware that the component that caused the short circuit might flame down or start to smoke! For this you just need to unplug the system and press the power button till all LEDs are off then you can reconnect and start it.
 
So... I think I've found the problem, I've taken the mobo completely out and it looks like one of the pins in the USB 3 header had bent and is touching another pin.
 
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