PC doesn't boot after adding RAM

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Dvir__

Commendable
Jan 22, 2017
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I have Lenovo M91P 7052-b5u i5-2400 (spec sheet) with 2+1 GB RAM

LoJ87.jpg

look like this.

Because I have 4 sockets, I decided to add 2 more.

Yesterday I added Kingston 4+2 GB RAM 99u5471, but the PC didn't boot. It was black screen - no POST.

I thought maybe the new RAM wasn't compatible - but after I took out the old 2+1 RAM, everything worked just fine.

So right now the PC boot only if I putting OR only the old RAM OR only the new RAM but not both of them.

What can cause this? Is it because the size is different? (the Kingston is smaller than the old ones)

(I already tried to switch between the sockets)

Thanks!
 
Solution
TheBeerAddict
The fact that your system posts with one kit indicates that you made a bad decision on mixing those DIMMs together.
You can do some things that are not guaranteed to work,like changing the frequency in BIOS to 1333Mhz if its in auto.
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TheBeerAddict

TheBeerAddict

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Sep 14, 2015
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The fact that your system posts with one kit indicates that you made a bad decision on mixing those DIMMs together.
You can do some things that are not guaranteed to work,like changing the frequency in BIOS to 1333Mhz if its in auto.
 
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Solution
T

ToxykVib3

Honorable
Feb 15, 2015
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are the rams different clock speeds?
If so read this:


"There are two things that can happen depending on the specific RAM modules
(brand, timing and motherboard compatibility),

The two modules will work effectively at the lower speed
this is safe and will only make you lose the speed edge of the faster module
(besides losing the DDR advantage, that is)
The modules will not be acceptable by your board together and it will declare memory failure"

Usually your motherboard will underclock the memory to the lowest speed and it will all be fine but sometimes it wont do that.
 
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TheBeerAddict

TheBeerAddict

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Sep 14, 2015
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Yes...The Kingston has a clock speed of 1600Mhz and the other one is at 1333Mhz.Thats why i mentioned that you should change the RAM frequency in BIOS to the lower one (1333Mhz) manually and then place the Kingston set.
 
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T

ToxykVib3

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Feb 15, 2015
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It should do it automatically tho, my guess is if it didn't do it he won't be able to change it manually. But yeah, give it a try
 
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