PC won't go through POST after replaced RAM

November 10, 2010 at 09:22:36
Specs: Macintosh
My system:
Intel Core2quad
Gigabyte GA-P35-DS3L mobo
Original RAM - Kingston 2x 1GB PC6400 800 MHz rated at 2.2V

New RAM I tried to replace - Kingston 2x 2GB PC6400 800 MHz rated at 1.8V

So last night I tried replacing my old RAM for 4gb of RAM because my CAD/CFD software has been maxing out my 2gb set-up. I bought the RAM and Fry's thinking they would work in my computer. By the way, I did not know they were 1.8V sticks until my computer crapped out on me, and pulled them out to have a closer look.

Anyway, my computer keeps turning on, and turning off, over and over again. It fails to give any beeps, so I'm assuming it failed or didn't go through POST. Could it be due to the difference in RAM operating voltage? I even tried resetting the CMOS and it still does the same thing. Turns on for a couple seconds (HD starts spinning, video card fan starts, etc.) and just turns off. After a couple seconds, it turns on again and does the same thing. This keeps on going unless I hold the power button, or cut the power to the PSU.

Please help!


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#1
November 10, 2010 at 09:39:16
sounds like psu is bad, try to replace it. Core 2 quad what?

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#2
November 10, 2010 at 09:45:46
Did you try booting up with just 1 2GB stick of RAM just to see if the same thing happens? What did you have the RAM voltage set to with the new RAM ? If it was 1.8V, you also might try increasing it slightly.

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#3
November 10, 2010 at 09:51:18
Wow, thanks for the quick responses!

Kuwese, I don't remember exactly but I believe it was something like E6600? I'm having a hard time thinking the PSU is bad. This started happening after I installed the new RAM. Could installing improper RAM cause the PSU to go bad?

kx5m2g, the computer won't even go through POST, so accessing BIOS is not possible. I haven't tried that, but I have tried turning it on without any RAM and tried it with the old sticks in. Same symptoms.


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Related Solutions

#4
November 10, 2010 at 10:02:09
All DDR2 memory is SUPPOSED to run at 1.8v. The fact that your old RAM required 2.2v means that it's probably factory overclocked PC2-5300 rebadged as PC2-6400.

The E6600 (if that's what you have) is a 1066MHz FSB CPU, so the optimal RAM speed is 533MHz not 800MHz.


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#5
November 10, 2010 at 10:21:18
yes mick is right about ram. I think your cpu is q6600 2.4ghz. U have all the symptoms of bad psu.

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#6
November 10, 2010 at 10:47:00
mickliq, that makes sense. The 2.2V stick is a Kingston HyperX type, so I guess they overclock it at the factory and label it "HyperX".

I'm sorry, it is a Q6600. The quad core version and yes it does have a FSB speed of 1066 MHz. I will return the 800 MHz ram and get a 533 MHz. I plan on running 2 x 2GB ram in dual channel.

kuwese, I'm still having a hard time wrapping my head around the fact that the PSU could be bad due to less-than-optimal ram. I even made sure to touch the metal in the case, and I always keep my toes touching the case while I work inside the computer.


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#7
November 10, 2010 at 10:52:20
You don't have to return the RAM, just change the BIOS settings to run it at 533MHz.

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#8
November 10, 2010 at 11:02:12
mickliq, I will do that.

Do you guys suggest that I replace my PSU then? Cause I can't even get in to BIOS right now.


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#9
November 10, 2010 at 11:59:56
I still think that you should try booting up with just ONE 2GB stick of RAM to see if you can get into the BIOS.

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#10
November 10, 2010 at 12:26:39
Thanks kx5m2g, I will try that when I get home later.

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#11
November 10, 2010 at 21:52:01
kx5m2g, I tried booting with just one 2GB stick and still get the same symptoms. Before POST even gives off a beep, the computer turns off. After a couple seconds, it'll turn on again, and repeats.

I'll go get a new PSU tomorrow and see if it fixes the issue.


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#12
November 11, 2010 at 06:54:17
Well, it was worth a try, but now a new psu, as others suggested, would be your best bet.

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#13
November 13, 2010 at 19:58:56
So I just installed a brand new Coolmax 600W PSU and now the computer stays on BUT the computer doesn't turn on.. if that makes any sense..

I don't see any LEDs come on on the mobo, but all the fans (case, cpu, video card) and hard drives do spin. No signal to the monitors (I have 2). I don't see any activity LEDs on the ethernet port. No beep from POST either.

I'm thinking the mobo may be bad now...


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#14
November 14, 2010 at 12:35:27
I should also note that the RAM I purchased had been previously opened.

I'm going to try buying a new mobo today and see if that fixes the issue.

Anyone have any suggestions? If there is a cheaper solution, I'm all for it. What should have been a simple RAM replacement has me spending a lot more than I want to. :(


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