10-23-2013 01:21 AM
I have just installed an i7 2670Qm on my T420 today.
The machine will crash pretty soon after booting up, with the screen having colorful vertical and horizontal lines before it restarts itself and give the memory error beeping pattern (1 beep-pause-3 beeps-3 beeps-pause-1 beep)
So then I took out one RAM from the bottom, and the machine appears to work normally again, more or less.
In the OS (Win7 64), The power manager alerts me that the 65w AC adapter is giving not enough power, so the laptop is running on battery. I thought I just need a 90W AC brick so the laptop will work as it should, so I am arranging a 90w one to come in later. But on a second thought, if the battery cannot start the laptop with 8GB of RAM properly, something must be very wrong here.
Can you good people tell me where may the problem be most likely?
Is it the CPU or RAM or Mobo or something else? Where should I look?
The machine works fine with the previous CPU i3-2310m and 8GB of RAM.
The RAM modules I have are 2 x 4GB Samsung 2Rx8 PC3-12800S-11-11-F3
The BIOS version is updated to the latest 1.46
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10-23-2013 02:13 AM
10-23-2013 03:19 AM
10-23-2013 03:35 AM
Thanks for answering!
I've done some more tests and here's the update:
When I'm on 2670QM, if I install a RAM module in the bottom slot, then it beeps for memory issue(1,3,3,1), be it 4GB or 8gb, it's the same. So I know that it's not RAM which is causing problem, but more like the slot.
Nevertheless, I still run some stress tests like Linx and stuff with one 4GB module installed in the slot under the keyboard. And I didn't detect any stability issue with this setup.
Therefore, I switch back to i3-2310m to see if it is really the slot that's having issue. I first boot into win7 with only one 4GB under keyboard, which works fine. Then I install both 4GB on the laptop to make it 8GB, and no issue at all.
So far, my findings have led me to suspect the i7-2670QM CPU I have here is the naughty one. Is this possible that a CPU will cause such a problem (causing one particular memory slot to malfunction), or there's other possibilities on what I'm encountering?
Thanks again for reading and following this thread.
10-23-2013 03:58 AM
10-23-2013 05:45 AM
10-23-2013 01:41 PM
Before doing anything else, It would be wise to find a 90W adapter and try with that. As Jin wrote in an earlier post, the 90W adapter alleviates from a lot of problems. In fact the 65W adapter might well be the only problem you have!
10-23-2013 03:41 PM
No, it's not an ES or QS coded processor. It's an SR02N.
I was thinking the same thing until I realised that if the battery alone cannot power the machine up, then something else must be wrong as well. But indeed I'm getting a 90W adapter to try.
One more thing I don't understand is that why the machine will not take ANY power from the 65W adapter, even when the machine is only consuming like 10W of power. I tried to plug and unplug the AC from my current 65W adapter, and the battery time just simply wouldn't change. This is very strange to my poor knowledge of laptop power management, couldn't it at least utlise a part of the power input from the 65W?
Thanks again everyone!
10-23-2013 04:05 PM
I don't know exactly what is going on, but there is a chance this is a safety measure built in the machine, concerning 45W cpus (i.e. 4core i7 Sandy Bridge). I have a strong feeling everything will work fine with 90W charger, but I'm not absolutely certain.