Computer Doesn't Boot Sometimes? I think

[M4A1]

I built a new computer just recently and started to have these minor problems lately. When I get home from work, I turn on my PC and it doesn't seem to bootup on the first try. I hear the HD and the fan and all that, but my monitor won't load up anything on the screen. I don't know if it's the monitor or if it's an actual hardware problem inside my PC.

I just turn it off by holding the shutoff button for a while and usually when I try to turn it back on the second or third try, it works fine and boots up. Everytime after that, it works fine.

It just seems like when I don't turn it on after a while, it doesn't bootup...

How can I troubleshoot this?

My specs:

Windows 7 Professional, 64-bit
ATI Radeon 4890
OCZ StealthXStream 700W
i5
Gigabyte UD4P

 

[M4A1]

Help?

Detailed specs:

CPU: Intel Core i5 720 2.66 GHz
RAM: G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM 1600 (PC3 12800)
MOBO: GIGABYTE GA-P55-UD4P LGA 1156 Intel P55
GPU: XFX HD-489A-ZDFC Radeon HD 4890 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP
PSU: OCZ StealthXStream OCZ700SXS 700W ATX12V / EPS12V SLI Ready CrossFire Ready
CASE: CoolerMaster CM 690
OS: Windows 7 Professional 64-bit
MONITOR: Samsung 225BW 22"

 

[MindoverMaster]

Hm, try to troubleshoot it by taking everything off, but one ram stick, your gpu card and power. Could be a hard drive problem.

Might want to reset your Bios as well, now that I thought of it.