New MB, RAM, CPU, PS, & case = dead PC

rb224315 · 03-03-2008, 11:28 PM

I purchased a new PS/case, MB, CPU, and RAM today, and assembled everything including the 2 hard drives from the machine I'm replacing. The machine ran for about an hour and without warning it shut down. Power and reset buttons have no effect--the CPU fan doesn't run, nor does any other piece of the system show any sign of life. Here's what I've done to troubleshoot:

Checked power coming from battery backup to PS. 120V ok.

Disconnected all internal connections from the MB except 24 pin power cable, ATX power cable, and power switch wire from front panel. Power switch still has no effect.

Took power switch from another case and connected to MB. Still nothing.

Removed memory & disconnected monitor and network cable. Nada.

By this time I have it narrowed down to PS or MB -- even if the CPU was toast, the fan should still run, right? Have I missed anything?

How would I go about testing the PS? I get voltage across the terminals of the ATX power cable -- is this sufficient to rule out the PS as the problem?

Thanks in advance for any input you might have.

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rjs735 · 03-04-2008, 08:57 AM

You can buy relatively inexpensive PS testors that plug into the various power connectors (one at a time) to test both the cable and the PS for proper voltage. They run about $10.

One last step to eliminate the MB. Remove the MB from the chassis (case) and put the mb on a cardboard surface with the static envelope as a spacer and hook up the power supply an sw. See if it powers up or even if the fans now run.

The MB should not stop the PS fans from running they are connected internally. So my guess might be the you have bad PS.

Lars A · 03-14-2008, 06:35 PM

Did you check the ATX voltages with this schematic?

ATX Pinout - Transwiki

SRTDodge05 · 03-14-2008, 06:52 PM

My guess would be the power supply. Is there a green led light on the motherboard?

03-03-2008, 11:28 PM	#1
rb224315 Registered User Join Date: Mar 2008 Posts: 1	New MB, RAM, CPU, PS, & case = dead PC I purchased a new PS/case, MB, CPU, and RAM today, and assembled everything including the 2 hard drives from the machine I'm replacing. The machine ran for about an hour and without warning it shut down. Power and reset buttons have no effect--the CPU fan doesn't run, nor does any other piece of the system show any sign of life. Here's what I've done to troubleshoot: Checked power coming from battery backup to PS. 120V ok. Disconnected all internal connections from the MB except 24 pin power cable, ATX power cable, and power switch wire from front panel. Power switch still has no effect. Took power switch from another case and connected to MB. Still nothing. Removed memory & disconnected monitor and network cable. Nada. By this time I have it narrowed down to PS or MB -- even if the CPU was toast, the fan should still run, right? Have I missed anything? How would I go about testing the PS? I get voltage across the terminals of the ATX power cable -- is this sufficient to rule out the PS as the problem? Thanks in advance for any input you might have.
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03-04-2008, 08:57 AM	#2
rjs735 Virus? What I am not sick Join Date: Jan 2003 Location: Central Florida Posts: 1,965	Re: New MB, RAM, CPU, PS, & case = dead PC You can buy relatively inexpensive PS testors that plug into the various power connectors (one at a time) to test both the cable and the PS for proper voltage. They run about $10. One last step to eliminate the MB. Remove the MB from the chassis (case) and put the mb on a cardboard surface with the static envelope as a spacer and hook up the power supply an sw. See if it powers up or even if the fans now run. The MB should not stop the PS fans from running they are connected internally. So my guess might be the you have bad PS. __________________ Giga ga-ep45-ud3p 2.8 E8400 4mb Ram WDC 500Gb XP pro Win7 32 Win7 64 Asus P4S8x 2.0 Ghz Celeron Ram 512MB WDC 80GB HD SATA WDC 80GB SATA Memorex DUAL DVD/RW Win98SE/XP pro Asus P2b-F Cel 450 Ram 256MB W98 SE Optorite CDRW WD 40GB Asrock P4combo P4 346 Xp Pro Sp 3 SATA HD SATA DVD/RW Foxconn 925EX 550 XP Media SP2 Sata HD Sata DVD/RW Foxconn 925EX 550 Xp SP2 Asrock 775Dual 550 Xp pro SP2 IBM T23 1.3hz RAM 512MB XP pro SP2 All systems are networked Konica Minolta Color Laser Samsung clp-315 Color laser Dlink 655 Dlink G650 Wireless Dlink DNS-323 1TB NAS
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03-14-2008, 06:35 PM	#3
Lars A Registered User Join Date: Jul 2003 Location: Stockholm, Sweden Posts: 178	Re: New MB, RAM, CPU, PS, & case = dead PC Did you check the ATX voltages with this schematic? ATX Pinout - Transwiki __________________ regards, Lars A 1. Main: ASUS P4C800-E ; rev 1.02 ; BIOS 1023, P4 2800 @ 3012mhz FSB:215=860,CPU Cooler: Zalman CNPS7000B-Cu,2g RAM (stock) 2,5-3-3-8 400mhz,1x300gb PATA Maxtor Diamondmax10,2x120gb SATA Maxtor Diamondmax Plus 9,Antec case 1080AMG-EC 430W TP,Club3D X800XTPE w. Arctic Silencer 4,DVD Pioneer DVR-A06,XP Pro Sp2,2 19" Philips LCD monitors,Logitech MX518 Optwire Rat, Logitech ,bluelite KB, Mobo AD Soundmax sound,TV-tuner Leadtek TV2000 XP Deluxe,Saitek Joystick and sep. gashandle 2. Games: Gigabyte GA965P-DS4, P4 3200@3500 880mhz busrate 1M L2, Zalman CNPS9700NT, 4gbyte RAM Kingston, Gigabyte 8600GTS graphics card, 2940U/UW SCSI controller, a 9gb compaq UW, IBM Scsi2. This one sux right now due to a slow CPU. Will upgrade to Core2Extreme when opportunity comes Play mainly Battlefield 2 ; mod Project Reality. No serious need for power... Switching between those with a VGA/USB Mouse/USB keyboard/headphone switcher from Aten.
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03-14-2008, 06:52 PM	#4
SRTDodge05 Grab Life By The Balls Join Date: Jan 2003 Location: Michigan Posts: 7,835	Re: New MB, RAM, CPU, PS, & case = dead PC My guess would be the power supply. Is there a green led light on the motherboard? __________________
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