boot - After building first computer, powering on works for only 2 seconds until it switches on and off infinitely
2014-07
Kalec
I have built my own pc, with z87x - UD4H / i5 4670k / 770 GTX.
I installed the CPU / stock fan / connected it to the MOBO.
Connected the 24 pin power supply
Connected the GPU / Ram / Sonar DX audio
Front panel connectors / front usb / 2 hard drives
The power supply is an old one, I think a 700w Gigabyte or something, it was very expensive when I bought it (worked just moments ago in my old pc).
When I plug the power cable and switch the PSU on, the ethernet cable is glowing, so power is getting trough all right, however when I switch it on, it starts spinning the fans, then after like 2 seconds it dies ... then it starts BY ITSELF again, and dies and so on and so forth.
What could this be ? What can I troubleshoot, should I remove the GPU and see if the PSU can handle the load (how do I do this, just remove the 6 & 8 pin connectors?)
Could I have damaged the CPU (I don't think I did, but I dread doing that).
EDIT: Removed the GPU, same problem, does not look like PSU
techie007
Do some basic hardware troubleshooting: Take everything out but the CPU and the motherboard. Boot it, does it beep like you have no RAM and/or no Video? If so, that's good since it doesn't have RAM or video.. If it doesn't beep, try reseating the CPU, if that doesn't help, then you most likely have a bad motherboard.
Ok, assuming it beeps -- now does it stay on? If so, that's good too, means your motherboard and CPU most likely aren't the problem. Now start adding hardware back in one piece at a time, until the problem starts again. That should narrow it down for you.
Jan Gressmann
recently my computer started to behave like an old car and won't start up anymore unless I flip the power switch repeatedly. What happens when I power it on:
- CPU fans spins briefly and very slowly, then it stops
- Same with GPU fan
- No BIOS beeps or HDD activity
- Screen stays black
After turning it on and off for like 10 times, it'll eventually boot like normal and run smooth without any problems what-so-ever. But I'm worried it might eventually die completely.
Anyone know the most common cause of this? Maybe I should just leave the computer powered on? :)
Okay just a little follow-up: Just one day after posting this my computer now refused to turn on at all, it seems my old mainboard just died (Gigabyte P35 DS3R for reference). I replaced the mainboard earlier today and everything is working fine again.
Michael B.
If I were you I would unplug useless stuff like Hard drive, CD drives and try another power supply.
If nothing else work, seems like your motherboard is having problem.
Check for bulging capacitor on your motherboard, it's a common behavior when this happen.
bryan
Sounds like a faulty power supply (inside the computer), or maybe the switch is broken.
Can you open the front of the computer (UNPLUG IT BEFORE DOING THIS) and examine the switch, check if there spring mechanism is functioning correctly.
But I would start with the plug, switch to a different power cable if you have one.
dag729
I am having the same thing happening with my powersupply as well.
I am using a Stealth X Stream OCZ series PSU. i don't recommand that series to nobody. YES they are affordable... but the caps inside the psu are cheap OST caps.
my psu just started doing this, had it for a little more then 3 years! oh and did i mension it was a 3 year warrenty? well i guess you get the point.
Anyway, what i think is the most important. Is to check the 12V and 5.5V sensor on the bios. if the computer ever start!
If you're 12V is lower then 11.88V then don't let that power supply on your computer.
same goes for 5.5V of 5.12V or lower.
Running your psu with low voltage sensors is comparable of riding at 120 mph at night with a toyota corolla during winter. (it dosn't matter how lucky you are, when it goes off it might as well bring your hole computer with it.)