GA-MA790XT-UD4P Keeps loseing hdd's/dvd

Hi every one since yesterday afternoon since I first turned my pc on I've been having a strange problem were all four of my sata hdd's and dvd drive's keep disappearing in the bios. Every time I switch my pc on and off sometimes just my dvd will be there and not my hdd's or some of my hdd will be there and not my dvd drive. I have managed to boot in to the windows 7 disk a few times but it comes up with an i/o error saying to remove the problem drive which I have removed each drive one by one but still the same problem each time I turn the pc on sometimes the hdd's/ dvd will be there sometimes not. I have just replaced the bios battery but it's still the same. I am about to update the bios but I cannot see this fixing it as it has been fine for the last 6 months

Many thanks
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More about ma790xt ud4p loseing
  1. Need way more detail to help:
    what's hooked up to which port?
    All SATA, mixed IDE/SATA?
    Power supply - what is powering the drives - modular?
    Single rail w/SATA connectors? Any MOLEX? Molex to SATA adaptors?
  2. Here's the specs mate thanks for your help. No molex adaptors

    cpu Phenom II X3 720 Black Edition
    mb GA-MA790XT-UD4P
    memory 4 gig kingston hyper x
    hdd 2x seagate sata
    hdd 1 hitachi sata
    hdd 1.5TB Samsung Spinpoint F2 sata
    dvd sony AD-7240S sata
    gpu xfx 4870 1 gig
    psu jeantech 700W Storm modular
  3. First thing to check: modulars, while excellent for cable routing and maximizing airflow by 'tailoring' the cable setup, are prone to a common weakness - the modular connector at the PSU itself. In the 'sticky', I mention troubles with the MOLEX to SATA adapters, where 'twisting' 'em one way will be fine, but a slightly different direction (or worse, when they 'relax' into a different position after some time...) makes 'em 'drop out'... With the mods, the main plug can suffer the same syndrome. Its almost never the actual pins on the PSU; when you look into the end of a mod plug, you will see a series of little brass 'cylinders' that 'wrap aroung' the PSU's pin, to make the contact. If one of these cylinders is not properly formed, or opened slightly, you will wind up with an intermittent. You want to either check the power delivery to the SATA plugs with a meter while 'wiggling' the modular PSU connector itself, or use a jeweler's screwdriver to bend any suspect ones slightly 'in' toward the center - this will give you a better 'clamp' on the pin itself. There's a pointer at the bottom of the 'sticky' the explains how to turn on the PSU for testing, if you select the 'meter' route...

    If you read through a bunch of modular reviews at JohnnyGuru, you will see that this is the main complaint about mods in general - even so, I'd never use anything else, now that I've seen how all-round convenient and functional they are - looking at a 1500W for the next workstation rebuild!
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