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Faulty Ram Controller?

Using Memtest86+ V2.01 ram in slot 1 (top slot) is reported as DDR1 CAS 3-2-2-0, in slot 2 (bottom slot) is reported as DDR11 CAS 4-4-4-12, both are FSB 133. The ram is GEIL 1Gb PC2-5300 DDR11-667 CL 5-5-5-15, I am using 2Gb in total. Is there a problem maybe with the memory controller or something else related? Memtest completes tests on both slots without a problem. I am using Windows Vista Home Basic and have intermittant system lockup and have to power off to restart the system, ctrl-alt-del will not work. When lockup happens I will get a problem with the screen picture of multiple lines in three columns down the screen with short black bars 2-3mm thick about 25mm long and 25mm apart from top to bottom and flickering. When this happens the system will not respond to mouse or keyboard and power off by power button will only work.

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  • Stephen Jan 13, 2009

    It is a Acer Aspire 4710Z laptop and has a basic bios, not many changes available. The Memtest86+ that I used is a full test and takes approx 15min to run on this system. I have noted the s/n of the ram slices and if they are not put 7000101 in bottom and 7000102 in top the system will power up but no bios check or system load will happen.

  • Stephen Jan 13, 2009

    The system is about one & a half years old approx and I am having random system lockup problems with a degraded display being the first symptom when it happens.

  • Stephen Jan 13, 2009

    If the ram or a controller connected to it is having problems, couldn't it cause display problems or lockup the system. I am also thinking of backing up the system and doing a full new install of windows, drivers etc...

  • Stephen Jan 15, 2009

    Do you rustyk123 know of a good tester for the onboard video, I had a look at a friends acer laptop and ran the memtest on his and got the precise info on his memory slices at the stated cas and ddr type. Unfortunately it was not the exact same model but it proved the memtest I am using is ok. I am definately going to back up the system data and do a full install of windows for good measure but not hopeful as I feel it is hardware not software.

  • Stephen Feb 03, 2009

    Bingo I have the problem nailed down to bad ram slice. Used latest memtest86+ V2.11 on each slice individually over and over 4 times and bingo one finally waved its hand and gave up. Thanks to all for your help and advice.

  • Dan rogers
    Dan rogers May 11, 2010

    sounds like a display issue to me when is the last time you updated your hardware drivers?

  • Dan rogers
    Dan rogers May 11, 2010

    It also kinda sounds like your cpu or the graphics card may be having issues. How old is the system?



  • Stephen Scheneman
    Stephen Scheneman May 11, 2010

    Can you change your CAS/RAS latency in the advanced BIOS options? And did you do the quick tests or the full tests with memtest? (Just curious...This is an interesting issue.)

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This does sound to be video problems. This could be caused by one of two things. 1) Faulty Video card 2) Faulty Memory/controller. I would sugest running a program to test the video card if it passes, try removing the top stick of memory (the one being falsely read) and try running it for some time under its normal use to test this.

Posted on Jan 15, 2009

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