Wont boot - no post, no signal but fan spins

[fullfrontal]

Fixed!
the culprit is a extra standoff near the motherboard.

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Hello. my pc won't boot. I tried removing ram then i hear beeps. But when i insert ram again. It won't even boot (no single short beep either) . I am using integrated gpu by the way. What do you guys think is wrong with my pc? I suspect faulty mobo.

Edit:
Cpu: AMD a4-3400 apu
Mobo: asrock a55m hvs
Psu: cougar sl500
Ram:1 x 4gb Kingston. no heatsink
Old system
Yes it booted before i just removed the video card then i wont boot again. I tried resetting cmos but that did not help either. I think psu is installed correctly. I also tried using a spare psu but still won't boot.

 

[helpstar]

please more informations about your configuration:
CPU, RAM, motherboard, power supply brand and model

PSU is installed correctly?

Did it boot correctly before? old or new system?

 

[fullfrontal]

EdIted sorry about that xD

 

[helpstar]

why did you remove the graphics card in the first place?

all power plugs inserted? additional 8pin (4+4pins) ATX12V plugged in too?

how did you clear the cmos?
remove power from wall plug, set clrcmos1 jumper to clear it, set back the jumper to default location, power on again

 

[fullfrontal]

Just borrowed that graphics card. So im returning it. Yes they're all plugged in. Tried clearing cmos. Still won't reach bios

 

[helpstar]

unplug any sata devices, USB, even keyboard and mouse
just powersupply, motherboard, CPU, CPU cooler with fan, RAM, monitor

can you borrow the graphics card again?

 

[fullfrontal]

Found the problem
I think the case grounds the motherboard. I works fine outside the case

 

[helpstar]

use standoffs between motherboard and case
http://en.wikipedia.org/wiki/Standoff_%28separator%29

which case is it?