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System won't boot with 2 ram sticks

Last response: in Motherboards
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August 13, 2011 4:31:37 PM

Hi Guys,

I just assembled a new system (no OS installed yet). When I first started it there came just a long beep out of the system speaker, lasting for about 5 sec., stopping for 3 sec. and repeating over and over again. No video either. I read in the manual of my mainboard that this was a graphics card error.
But it wasn't. The system didn't even start with another, working vga installed. Same error beep code and no video.
Then i looked further and removed one of the two ram sticks installed (Corsair Vengeance 2x4GB, see specs below). The system started. Then i seperately checked both ram sticks on the DDR3_1 and DDR3_2 (blue and white primaries) and the system started, too. So it's not the ram sticks.
But the system doesn't start with one stick on the secondaries (e.g. only DDR3_3), don't know if that is normal.
And as mentioned above, it doesn't start with both sticks installed on dual channel mode (e.g. DDR3_1 + DDR3_3 or DDR3_2 + DDR3_4)
I even booted with one stick, went into the bios and changed the settings to 8-8-8-24 and voltage 1.5v (as specified, the other values weren't changed), but it didn't start with both ram sticks installed either.
I know my ram is not on the compatibility list of the mainboard, but i never had problems with that. And shouldn't both sticks work if one of them works? What could be the problem?

My specs are as follows:
MB: Gigabyte GA-870A-UD3 ->Product Page
CPU: AMD Phenom II X6 1090T Black Edition, 3.2GHz, Socket AM3
RAM: Corsair Vengeance, 2x4GB, DDR3-1600, CMZ8GX3M2A1600C8 ->Product Page
VGA: Sapphire HD 6870 1GB, PCI-E x16
PSU: be quiet! STRAIGHT POWER, E8 CM 680W 80plus Silber
Cooler: coolIT ECO, all-in-one Mini-WaCo CPU-Cooler

Thanks for the help,
m45k

More about : system boot ram sticks

a b V Motherboard
August 13, 2011 5:44:45 PM

test your ram with memtes86+, try 1 by 1 , follow instruction from memtest. If your have feature memtest use it
a b V Motherboard
August 13, 2011 5:45:13 PM

test your ram with memtes86+, try 1 by 1 , follow instruction from memtest. If your mobo have feature memtest use it
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August 13, 2011 6:42:28 PM

Thank you for the fast reply.

I've now tested both sticks separately (with boot version of memtest86 v4.0) and both of them keep getting stuck at 25% in Test 7 "Block Move". There are popping up errors with a rate of 200/sec. I stopped the test at 300K Errors because it seemed like testing the same over and over.
Are both of my ram sticks defective?
August 15, 2011 7:44:56 AM

try the ram piece by piece, if one of the ram is working when booting the system so, it means it is not compatible with each other... thanks...
a b V Motherboard
August 15, 2011 7:49:55 AM

and be sure again that the RAM slot is also clean, clean use compressor for dust ! in testing RAM the system should be the default, and you have tested one by one and tried in another slot. it means the RAM ready to RMA
!