monitor doesn't start when i installed new gpu

avsc07

Reputable
Sep 28, 2014
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4,510
Someone please help me.....I recently bought a sapphir radeon r7 240.There is no need of connecting power connectors to it. So I straight away installed it in pcie 16 slot and connected vga cable from board to graphics card. When I try to boot pc my monitor shows no vga input no dvi input and it goes to sleep. I've uninstalled my on board graphics drivers and disabled too.. but still the results are the same... I've tried connecting vga cable to board and it works...minimum power required is 400w and I have 450w psu..is this the problem with graphics card or something else...Please please please help. .I'm totally lost