"No Signal" flashes before Win7 load screen

[BukitHedd]

Heres my system I built last week.
2600k.
Asus P8Z68-vPro Gen3
8gbs Corsair Vengeance low profile ram.
No video card yet.
OCZ Vertex 3 120gb boot drive and a Hitachi 2tb hdd.
Windows 7 Home.

Here's my problem, although I'm not sure its a problem.
I just started to overclock a bit, but I'm not feeling confident about it so I reset everything back to what I think it was before I started.

I notice now that when the computer boots, I get the Windows Loading screen, then the monitor goes blank, says "No Signal", and my keyboard backlighting turns off for a split second. Within a couple seconds I see the login screen. This whole event only takes 2-3 seconds. No hiccups during normal use.

I'm just wondering if its somewhat normal. It may have been doing it all along and I've never noticed.
I'm going to reset my CMOS because I want it all at default settings for now until I research overclocking more.

Thanks.

[Reyzac]

Happens to me too. I wouldn't worry too much about it.

[KaptCrunch]

possible in cmos settings for video

has video boot order looking in slot video for first boot , moniter then No Signal

don't see it then moves to onboard video, then you got screen