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faktura
Paper Tape
Posts: 5
Registered: ‎12-06-2016
Location: US
Views: 1,779
Message 1 of 9

Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Hello, i got this little problem with my G550 (model 20023). I decided to do some memory upgrade and bought Corsair 2x4GB MacMemory (CMSA8GX3M2A1066C7). Those modules are 1066 MHz and should be supported by GM45 onboard, and 1,5v - same as the stock Hynix 1GB+2GB modules (1GB is HMT112S6BFR6C).

 

The problem is that when i place two new 4GB modules the laptop powers on, lights are on, HDD probably spinning, but screen stays blackSmiley Sad

 

When i try only one 4GB module everything is working fine, with old 2GB + new 4GB it works probably fine, BIOS and W7 recognizes 6GB as it should. Any advice will be very appreciated.

Sr Support Specialist
Posts: 9,313
Registered: ‎11-30-2015
Location: PH
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Message 2 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Hi faktura , 

 

Welcome to the Community Forums.

 

Would you be running on a 32 bit or a g4 bit Windows 7 ?

Would using one 4GB work as tested on each slot alone?

 

Similar discussion here and here that you can also review . 

 

Update us soon as convenient

 

Regards



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faktura
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Message 3 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

I tried separately both modules and they work fine. With both of them laptop turns on but nothin shows on screen, no Lenovo logo, no Windows 7 Start screen, only darkness and sadness, CPU fan starts working for a second and after that it stops and nothing happens. At the moment W7 x86 is installed but it still can see 6GB of ram if installed showing only less than 3GB available 

 

Is this could be fault of CPU? I have stock T4200 installed but i plan to replace it soon for T9400.

Sr Support Specialist
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Message 4 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Hi faktura , 

 

Greetings.

 

What we are looking at is the physical limit of Windows 7 x 86bit architecture limit of 4GB .

Check ram functionality on a Windows 7 x 64bit .

 

Regards



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faktura
Paper Tape
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Message 5 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Hi

 

Correct me please if im wrong but i think usable memory by OS is not a problem here, because computer does not turn on as it should.

 

If it could be a problem please tell more how it is possible that with 6GB computer turns on and Windows 7 recognizes 6GB installed memory, and with 8GB computer does not turn on.

Sr Support Specialist
Posts: 9,313
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Location: PH
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Message 6 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Hi faktura , 

 

Greetings.

 

RAM is one of the devices essential to a valid POST (power on self test) depending on how the machine and BIOS (such as dual-channel incorporation) compensate for the configuration it is currently in ( non matched RAM 2GB + 4 GB allows boot but only recognize 4 GB and 2 GB wasted). 

 

Most were successful on their upgrades similar here and here on their 64 bit OS.

Take time to review provided links for further reference. You may also check with your local IT / tech or the guys in Corsair for confirmation. 

 

Hope this help answer your query.

Update us how it goes specially with 64 bit Windows. 

 

Regards



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faktura
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Message 7 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

I did some more checks, unfortunately i found that when 4GB modules are inserted into top memory slot the computer does not turn on, blank screen, only in one out of few tries screen started flashing brightness quickly :/

 

This guy probably have the same issue with Corsair kit unfortunately without any solution

link

 

Available memory reported in system is not a problem because when i confirm that laptop will boot up with 8GB i will surely go for x64

 

----------------edit------------------

 

So apparently there is some strange thing going on because... i just tested Samsung 4GB M471B5273CH0 on top slot with Corsair 4GB on lower slot and... it worked like a charm, computer did boot without any problems and 32bit W7 recognized 8GB (most of it not available ofc)

Sr Support Specialist
Posts: 9,313
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Location: PH
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Message 8 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Hi faktura , 

 

Good that you have available Samsung 4GB M471B5273CH0 to match and check if both Corsair would fail on the top slot. Such woul;d be the same information you need to report back in Corsair .

 

Product specification :

Memory : Up to 8GB DDR3 DRAM 1066MHz

 

Since the idea is to have 8 GB sweetspot of usable memory (not just  the 3 GB barrier).

2 X 4GB ram would allow also dual-channel synchronization .

 

Regards



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faktura
Paper Tape
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Location: US
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Message 9 of 9

Re: Lenovo G550 8GB RAM upgrade problem with GM45 - blank screen

Sorry but solution to this thread makes me laugh and cough Smiley Very Happy

 

Corsair said that i need 1,35V instead of 1,5V... and stock Hynix modules were 1,5V and they were just fine!

 

Sooooo i got two Samsung 4GB modules (M471B5273DH0) and it works like a charm, and also there are no side effects of replacing T4200 for T9400 except a bit higher working temp, good thermal paste should fix that.

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