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Home>Knowledge Base>I've installed memory in my system but now the system doesn't boot at all.
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Article ID18
Created On6/4/2009
Modified6/4/2009
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I've installed memory in my system but now the system doesn't boot at all.
Try each of the following, one at a time:
Turn the system off and reseat the memory module.

Turn the system off and install the memorystock  memory module in the first socket.
Turn the system off and install the memorystock memory by itself.

Check to make sure all expansion cards are fully seated. Expansion cards can pop out of the socket while memory is being pushed into its socket.

If you don't hear any hard drive activity and no LED lights are lit on your computer, it's possible that you may have inadvertently disconnected the "Ribbon Cables" inside your system. The gray ribbon cables must go back in a particular order. If they have been installed backwards your pc will not boot properly or not at all. The red edge (typically red) of the ribbon cable indicates pin 1 and has to be aligned with pin 1 of the socket. Please look very closely at the edge of the cable socket on the motherboard to find out which is pin 1 or consult your system's manual.

An ATX12V or SFX12V with the 2x2 connector is required for all Pentium® 4 processor based Intel® Desktop Boards. Power consumption requirements for high-end video cards, sound cards, peripherals, and the Intel® Pentium® 4 processor will exceed the typical 5A current capacity of standard ATX & SPX power supplies.

The ATX12V and SFX12V power supply design guides (http://www.formfactors.org/) recommend a minimum of 8A at 12Volts to properly power any Pentium 4 processor based Intel® Desktop Board. Standard ATX and SFX power supplies typically provide approximately 5A of current, which is not capable of reliably powering the Pentium 4 processor based Intel® Desktop Board.

Verify that the module was installed correctly and that the module's specifications match those in your system owner's manual. If the memory is installed properly and the specs match those set forth in the owner's manual, the module may be bad and should be returned to the place of purchase for replacement.

WARNING! Installing a memory module backwards may cause damage to your memory module and or system board.