Sil3512 pci sata randomly[?] does not deterct a HDD

i have a 8kha+ epox mb and a sil3512 pci sata controller, and a
seagate sata hdd

i was happy with this set for a month, and a week ago smth weird began
to happen:

if i unplug my PC from the power outlet [not only shut it down, but
leave it without power] - my sata controller [it works fine, i can see
it's BIOS every boot] does not detect my HDD. this happen till i
change the PCI slot my controller is attached to. as soon as i shut
down the power the same story happends - ususally i do 2-4 attemts of
changing the PCI slot till my sata is happy.

any advice what should i touch in the bios? i have the latest version
for this type of MB

arro239 wrote:
> i have a 8kha+ epox mb and a sil3512 pci sata controller, and a
> seagate sata hdd
>
> i was happy with this set for a month, and a week ago smth weird began
> to happen:
>
> if i unplug my PC from the power outlet [not only shut it down, but
> leave it without power] - my sata controller [it works fine, i can see
> it's BIOS every boot] does not detect my HDD. this happen till i
> change the PCI slot my controller is attached to. as soon as i shut
> down the power the same story happends - ususally i do 2-4 attemts of
> changing the PCI slot till my sata is happy.
>
> any advice what should i touch in the bios? i have the latest version
> for this type of MB
>

Replace the mobo battery? Also, flush the BIOS.