PC Not Detecting Monitor, CRC Error

Anthony Tomlinson February 4, 2009 at 11:00:13
Specs: Windows XP & Ubuntu 8.10
I built my own PC & have 2 issues that I cannot figure out. The PC will work fine for 1-2 weeks, then when booted, the monitor keeps flashing from analog to digital & then goes black & the PC won't boot. Eventually, the PC will boot again, but I get CRC errors. After a few days to a week, the PC will again work fine for about a week & the cycle repeats itself. I have done the following:

-ensured everything is properly connected & seated
-removed half of the RAM
-ran memtest & it passes except for when CRC problem occurs, when problem occurs memtest shows many, many errors
-when CRC error occurs, I can boot off of an Ubuntu live cd, which should indicate good RAM, motherboard, video cards, etc
-replaced IDE hard drive with SATA hard drive: no CRC errors yet, but monitor is again flickering between analog to digital & PC won't boot

My system specs are as follows:
-AMD Phenom 9600 Agena 2.3GHz Socket AM2+ 95W Quad-Core Processor
-Crucial Ballistix Tracer 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
-Crucial Ballistix 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
-2 ZOGIS ZO86GT-E GeForce 8600 GT 512MB 128-bit GDDR2 PCI Express x16 SLI video cards configured using SLI
-ASUS M3N-HD HDMI AM2+/AM2 NVIDIA nForce 750a SLI HDMI ATX AMD Motherboard
-Antec NeoPower 650 Blue 650W ATX12V / EPS12V SLI Certified CrossFire Ready Modular Active PFC Power Supply
-2 Samsung 20X DVD±R DVD Burners with LightScribe, both connected via SATA
-Samsung SynchMaster monitor connected via DVI


See More: PC Not Detecting Monitor, CRC Error

Report •


#1
February 4, 2009 at 11:22:25
Sounds like you have a memory problem. Do both pairs of RAM run at the same voltage & have the same timings? Did you manually configure the memory settings in the BIOS? If not, do so.

You also have the 'bad' Phenom. The ones with the 'fix' have 50 for the last two digits in the model number. There is a workaround for the bad Phenoms that *should* have been implemented in a BIOS update, at the cost of a 10% performance hit. Regardless, make sure you have the latest available BIOS version.

http://techreport.com/discussions.x...

I believe AMD was offering free replacements for the 9500/9600. You may wanna look into it.


Report •

#2
February 4, 2009 at 12:14:34
Thank you for the reply. However, wouldn't the fact that I can boot from an Ubuntu live CD when I get the CRC errors mean that the memory, motherboard, video cards, etc are fine?

Report •

#3
February 4, 2009 at 12:51:23
"-ran memtest & it passes except for when CRC problem occurs, when problem occurs memtest shows many, many errors"

The fact that memtest is kicking out errors indicates a hardware problem, most likely memory. Update your BIOS to version 1502.

http://support.asus.com/download/do...


Report •

Related Solutions

#4
February 12, 2009 at 19:19:02
I haven't been able to boot the PC since the last post, so I haven't been able to upgrade the BIOS. I removed all of the RAM & still can't boot, so I suppose this is a motherboard memory issue, not the RAM memory. Is there any way I can get this done, or will I have to wait it out until the PC will boot again, as usually happens after a week or so?

Report •

#5
February 14, 2009 at 13:33:30
So I guess the question is, if the PC won't even boot to POST, is there any way I can upgrade the BIOS?

Report •

#6
February 14, 2009 at 14:16:09
Of course it wont boot if you remove the RAM. RAM is essential. Even when you are booting from the Ubunto CD you are still using the RAM as well as all the other components of the computer.

Get some new RAM as that is most likey where the problem is.

Stuart


Report •

#7
February 17, 2009 at 12:23:39
I realize that RAM is essential, but shouldn't it at least go to POST without RAM? Its doing the same thing with or without RAM: monitor flashing between ANALOG & DIGITAL, then nothing. So, it appears to be a motherboard memory issue. Can I upgrade the BIOS if the PC won't even boot to POST?

Report •

#8
February 18, 2009 at 16:42:12
Does anyone have any suggestions?

Report •

#9
April 10, 2009 at 20:45:39
Its been a few months since my last reply. I have updated the BIOS to the current version. Once again, the PC worked fine for roughly 1 month, but now is again not booting, with the monitor flashing between ANALOG & DIGITAL before going to a black screen.

Report •

#10
April 11, 2009 at 09:38:50
The real question is, where do I start? It will be difficult to try to convince an equipment manufacturer that their part is bad when I need to exchange it. I figure I should assume its the motherboard? It could also be 1 of the 2 SLI video cards or the power supply. I do not think its the RAM.

Report •


Ask Question