Can't reboot - help needed!

So today I decide to install a new fan in my box. Everythign goes well, although a little tight. Then I can't reboot. Very strange, the boot sequence does an unusual long pause at the "NF4 SLI" line, then it finally detects my IDE DVD, and then it fails to detect my 2 SATA drives and hangs.
I looked, nothing seems disconnected. I don't get it...I resetted the biso just in case, and now of course I can only se the DFI logo and it still won't boot.
Loos liek the HDDs are not powered, but then why the long pause before detecting the DVD player?
Damn, this is killing me. Any help woudl be greatly appreciated!

Did you take the motherboard outta the case? If you did it could be that you need to reseat the mobo. If not take the fan off and see if that helps.

nope did not remove the mobo, and taking out the fan doesn't change anything... Also, I noticed 1 LED on the LED diagnostics stays on.

The manual should tell you what it is. The only thing that I can think of is power.

Well it has "decided" to start again. I guess I'll never know why....