PC won't boot after memory upgrade (on MSI P45D3 Platinum)

I am having a problem on my MSI P45D3 Platinum motherboard system (Dual OS: Win XP and Win 7)
Until recently I was running it on PATRIOT 2GB (2x1GB) 1600MHz DDR3 PDC32G1600LLK memory (CL7) and all was fine, though running only at 1066MHz, since I couldn't tweak the settings (latencies/voltage) in order for it to run at 1600MHz.
I wanted to add RAM but since I couldn't find the same type anywhere in my town, I decided to go for PATRIOT 4GB (2x2GB) 1600MHz DDR3 PSD34G1600KH Signature Line (CL9). However, the system never booted again (blank screen, no signal sent to monitor) after adding the two new sticks of RAM! The new RAM is working fine when I remove the old and vice versa, so I know it is not a case of defective sticks.
I must mention that I cannot fiddle with the RAM timings because I cannot even reach BIOS!
Any help will be most welcome!

Mixing different memory modules is always a gamble and likely to cause such problems. Identical modules should be used for best results.
In many cases, you can set what you want regarding memory configuration, getting the RAM mixture to work stable will simply be impossible, even though there is no defect.

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Message was edited by: ovidiu marian

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Quote from: NexumxRaptoR on 07-November-13, 23:58:36
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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Copyright (C) 2004 Charles Cazabon
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This question was solved.
View Solution.

Hi,
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