Problem with my PSU?

Fujis · 10-05-2007, 05:08 PM

Here's my problem. A couple of weeks ago my computer started taking anywhere between 15 seconds to 5 mins to turn on when the power button was pushed. I am using a BFG 650W PSU. It could stay on forever and restart with no problem but if it ever turned completely off it would have this problem again. I wasn't sure what was going on but eventually the computer stopped turning on altogether. I figured the power supply was dead so I sent it back to BFG and got a brand new one. I installed this one and attempted to turn it on but still it does not turn on. When the power button is pressed the interior of the computer will light up for half a second. CPU and video card fans start to spin but then nothing like the computer is getting a jolt or something. It will not do this again until I turn the power supply off and then turn it back on with the switch on the PSU and then pressing the power button again. I've tried unplugging everything from the supply besides the motherboard but it does the exact same thing everytime. Any ideas on what could be causing this or what I might be able to do?

dai · 10-05-2007, 06:21 PM

set it up out of the case with
video
cpu
ram
speaker
and see if you get post
check both sides of the m/b for damage,it sounds like a short somewhere

Fujis · 10-06-2007, 10:28 AM

Ok I tried that and still nothing. I checked the motherboard and I don't see anything wrong with it or smell anything. I decided to test the motherboard only with the RAM in it with a power supply from an older computer, a 400W PSU. I attached it and the power switch from the older computer and tried it. The motherboard came on and the fan spun up and stayed on. I then attached the 650W PSU and the power switch from the current computer to the older computer. It turned on just fine. The 650W psu just refuses to turn on the current computer. It still only will cause the fan and light to come on for a split second and then nothing. Any ideas?

**linderman** · 10-06-2007, 04:09 PM

sounds like a motherboard problem

**TheMatt** · 10-06-2007, 06:55 PM

What are all the specs?

10-05-2007, 05:08 PM	#1 (permalink)
Fujis Registered User Join Date: Dec 2005 Posts: 9 OS: Windows XP	Problem with my PSU? Here's my problem. A couple of weeks ago my computer started taking anywhere between 15 seconds to 5 mins to turn on when the power button was pushed. I am using a BFG 650W PSU. It could stay on forever and restart with no problem but if it ever turned completely off it would have this problem again. I wasn't sure what was going on but eventually the computer stopped turning on altogether. I figured the power supply was dead so I sent it back to BFG and got a brand new one. I installed this one and attempted to turn it on but still it does not turn on. When the power button is pressed the interior of the computer will light up for half a second. CPU and video card fans start to spin but then nothing like the computer is getting a jolt or something. It will not do this again until I turn the power supply off and then turn it back on with the switch on the PSU and then pressing the power button again. I've tried unplugging everything from the supply besides the motherboard but it does the exact same thing everytime. Any ideas on what could be causing this or what I might be able to do?

10-05-2007, 06:21 PM	#2 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,539 OS: win 7 32x 64x rtm	Re: Problem with my PSU? set it up out of the case with video cpu ram speaker and see if you get post check both sides of the m/b for damage,it sounds like a short somewhere __________________

10-06-2007, 10:28 AM	#3 (permalink)
Fujis Registered User Join Date: Dec 2005 Posts: 9 OS: Windows XP	Re: Problem with my PSU? Ok I tried that and still nothing. I checked the motherboard and I don't see anything wrong with it or smell anything. I decided to test the motherboard only with the RAM in it with a power supply from an older computer, a 400W PSU. I attached it and the power switch from the older computer and tried it. The motherboard came on and the fan spun up and stayed on. I then attached the 650W PSU and the power switch from the current computer to the older computer. It turned on just fine. The 650W psu just refuses to turn on the current computer. It still only will cause the fan and light to come on for a split second and then nothing. Any ideas?

10-06-2007, 04:09 PM	#4 (permalink)
linderman Moderator, Hardware Team Join Date: May 2005 Posts: 20,433 OS: win 2000 pro / Win XP pro My System	Re: Problem with my PSU? sounds like a motherboard problem __________________ I still know nothing and I respect that fact, striving to improve and, along the way, help anyone that comes from the place that I used to be! Power Supply Selection LEARN TO BACK-UP YOUR DATA FREE & EASY YouTube - Runtime Software DriveImage XML tutorial

10-06-2007, 06:55 PM	#5 (permalink)
TheMatt TSF Enthusiast Join Date: May 2006 Location: Boston Posts: 13,701 OS: Win 3.1, 98, NT 4.0, XP Debian 4.0, Kubuntu 6.06 My System Blog Entries: 3	Re: Problem with my PSU? What are all the specs? __________________ - Matt M - KB1OSC - Folding@Home 85015 [url="http://www.techsupportforum.com/hardware-support/"] If TSF has helped you, please consider donating. If I have stopped responding to a thread, feel free to send me a PM with a link to the thread. It is advisable to subscribe to threads so you will receive updates when replies are posted. You can subscribe to threads from the "Thread Tools" Menu. »Memtest86 »Prime95 »UBCD »SpeedFan »NHC Personal »Everest »Sandra »PC Wizard »RivaTuner »ATi Tool Click here for Useful Articles and Guides