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No signal on monitor?

Hi, I've just upgraded my pc this evening and when I try to turn on my computer, everything works fine. The CPU fan and the graphic card fan is spinning like normal. The only problem is, the monitor shows no signal. I am pretty sure its not the graphic card that is causing the problem. Here's my old and new specs :

Motherboard - MSI G31TM-P31 --> GA-M68MT-S2
Processor - Intel Pentium Dual Core 1.6GHz --> Phenom II x4 955
RAM - 2x1GB Kingmax DDR2 800MHz --> 1x4GB Corsair Vengeance DDR3 1600MHz
Graphic card - ATI Radeon HD5750 1GB
Power supply - 230W / 450W

Can someone please help me? Is it possible that the lack of power supply might cause the problem? Thanks.
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  1. Best answer
    Try connecting the Monitor to the Onboard Display port, not the GPU display port and see if you get to the BIOS screen.
    If you do, then in the BIOS you need to change your Primary Display Adapter from IGP/Onboard to PCIe.
    After that save and exit and then connect the Monitor to the GPU display port.
    It ought to work, usually the BIOS detects the GPU in the PCIe slot and makes it the primary one, but, sometimes this does not happen until we tell it to.

    Another short note. I can't find your 4Gb Single Slot of RAM on the QVL
    http://download.gigabyte.asia/FileList/Memory/mb_memory_ga-m68mt-s2_v1.3.pdf
  2. Best answer selected by mousemonkey.
  3. This topic has been closed by Mousemonkey
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