T420 memory upgrade problem

[newguy2010]

Hi,

I have this weird problem. I recently upgraded the Ram from single 4GB to 8GB, using another single 4GB Kingston ram. But After that I can't even watch a full movie. My laptop restarts every 40 minutes. I have checked the system and it displayed 8GB(7.96GB used), I have also used the ThinkVantage tool to do a memory test. The test results told me I have two types of ram, one is Micron, which is 4GB and the other is 4GB Kingston. All the tests in the ThinkVantage tool passed. But when I tried to run Memtest it failed and restarted again.

Is it possible that the memory upgrade causes my system to restart? My Laptop's spec is:

i5-2410M, 64bit Win 7 HP, 4 + 4 GB ram, 160GB Intel SSD.

The system is new. I have never installed anything on it after I got it except for a windows media player classic and some media codecs.

Please help. Thank you.

[jvarszegi]

Sounds like you may have faulty RAM. Is it the correct type? Does it have the same timings as the original DIMM?