New GPU installed but fan doesn't spin & there is no display

_leoo

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Aug 24, 2010
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System Model: Studio XPS 8100
BIOS: Default System BIOS
Processor: Intel(R) Core(TM) i5 CPU 650 @ 3.20GHz (4 CPUs), ~3.2GHz
Memory: 8192MB RAM
Available OS Memory: 8120MB RAM
Page File: 10093MB used, 6143MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
PSU: 350 W

I replaced my gpu with Radeon HD 7790, got it put in.. But when I turn on the computer, there's no display and the fan isn't spinning. What could be the problem?