loading operating system

I've had my system running for almost 2yrs and now it want load the os,it boots up to can't find any devices but the controller shows me al my drive that are on board.....
WINDOWS 7 X64
GIABYTE970A-UD3
RAIDMAX 720 W PSU
ADATA SX910 SATA 3 IN ACHI
SAPPHIRE 6870
WD velociraptor 600GB@10K RPM
PCIe sata 6g 2 ports external
Rosewill wireless Dualband PCIe
all where working without any problems i started to notice it took longer to start up and acronis true image 2014 was having problems backing up my system..any help would be appreciated.
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  1. ok this is what i did;i checked the hardware first
    which was: C drive..its ok
    wd velociraptor onboard storage ok
    Solid 3 onboard for backup drive...it
    was the problem in that windows was trying
    to boot from it(how i don't know because its
    a logical drive).i did check the bios and change the
    boot order and took each power connection from
    the sata drives...the Ocz solid 3 was the only one
    that the system didn't respond to...why i still checking
    but its working ok as long as the Ocz solid three isn't connected.
  2. i found a bad power supply cable!
    replaced it ;everythings ok.
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