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Odd problem in new comp build.

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#1 Rauchster


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Posted 28 February 2009 - 05:38 AM

Had just rebuilt a new computer with the following parts:
AMD Phenom II X4 940 CPU
ASUS M4A79-Deluxe Mobo
OCZ Reaper-HPC 2x2Gb DDR2 800 RAM
Xigmatek 750W Modular Power Supply
and combined them with parts from an old system build.
MSI NX8800GT 512Mb Gfx Card
2x Seagate Barracuda 500Gb HDD
1x WD Raptor 36Gb HDD (Sytrin Cooler)
Zalman 9700CNPS
LG DVD-RW Drive w/ Lightscribe
Cold Cathode Light system
Sunbeam Transformer Case

Build worked fine for about 72 hours, when this happened.

Had turned off the computer for the night.
Went to turn it on again the next morning.
All internal lights come on, and fans spin up normally, with no hesistation. But, there is no video output(monitor doesn't even recognize itself as being plugged in), nor is my USB Mouse/keyboard/headphones receiving any power at all. No lights on them, no responsiveness, no anything.

I'm pretty sure it is NOT booting into Windows either, as it would boot in about 45 seconds, and play the logon sound normally. The sound never plays, so either my speakers are receiving no signal (likely), or it's not booting (also likely)

The following has been done, with no results.
Took out each stick of RAM, and tried solo sticks in differing slots.
Disconnected all extraneous hardware except for motherboard/CPU/1 stick RAM/Gfx card/PSU.
Disconnected Gfx Card after that.
Reset BIOS using onboard switch. (multiple times)
Unplugged and replugged all power/data connections(including on the PSU), no loose ones found.
Disconnected Front Panel, and used onboard Power switch.
Tested PSU, seemingly works fine (Paper Clip test between green wire and ground wire, plus stuck in another computer)
Tested Gfx Card, works fine in another computer.

While it certainly is possible that it is the RAM (haven't had access to a computer with DDR2 memory slots, will later today) or CPU (no access to AM2+ socket type either, same with later), I'm assuming that it is the motherboard.

Does this sound right to others?

The only thing that doesn't fit with the motherboard theory, is that it is responsive to the onboard switches (Cool 'N Quiet was re-enabled after a reset, I had disabled it / Power switch works fine) and all lights come on, even on mobo.

But I don't see why a bad CPU would prevent power from going out the USB ports to a mouse (green lights around outside of Razer mouose do not light up, ever. Works just fine on other computer. Same with lights on on Ideazon keyboard, and Logitech Headset)

Same with RAM. Should have no effect on USB hubs.

I plan on taking this other AM2+ compatible computer, and swapping the CPU first. Then swap in each stick of RAM. Finally the entire assembly.

And then do it in reverse, by putting known working components in my bad build.

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#2 hamluis



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Posted 28 February 2009 - 01:13 PM

I would run Memtest on various memory configurations (one stick at a time, switching modules used after each successful run). A complete run of Memtest on this system takes about 2 hours, I would recommend at least 1 hour with each trial effort.

I'd try to rule out memory before moving on to items that cannot be tested easily (CPU, motherboard).

MemTest Manual - http://hcidesign.com/memtest/manual.html

Memtest86.com - Memory Diagnostic - http://www.memtest86.com/


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