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When I read your post, my immediate reaction was a PSU problem.

If you can, cut it down to the bare minimum. PSU, Motherboard, RAM and CPU, disconnecting everything else. Generally, I would unplug all leads and just start again from scratch; a single one can cause a problem and just pressing on all of them is usually ineffective. Then try booting up again. It is slightly hard to describe, but try and listen out for the point at which the BIOS kicks in. If possible, power it up with the case side off; usually easier to see what you are dealing with if you can see it.

If everything seems fine when you do that, try plugging in everything else one at a time. Try Hard Drive first, and listen for the single BIOS beep shortly after powering it up; if you don’t get that, then there is a problem there.

what kind of beeps

The reason AnimaL asked about the beeps is that each motherboard has its own ‘beep codes’ for diagnostics. For example, one of my old boards had a long low-pitched beep followed by a short high-pitched beep to mean, ‘keyboard not connected.’ (Don’t ask why I had to look that up.) It can be tricky info to find online, though.

Quoted from rtan

I see.

Well for some reason, tried booting without my graphics card in, just processor, ram and mobo. Seems to boot fine. But as soon as my graphics card is in it doesn’t boot.

If the mobo has a different pci x16 port try that.

Managed to get it working. New PSU and resetting CMOS settings seemed to fix it.