4 th SATA device not detected

dear friends,

I have an asus-m3n78-em-motherboard with 5 SATA and 1 ESATA ports on it.

3 SATA HDDs are detected properly but 1 SATA DVD Writer is not detected!
if i swap 1 HDD in place of DVD, then either of them is not detected!

I have tried with all ports individually, all are working fine, but only 3 devices are detected at a time.
I also flashed the latest bios patch! no gain.

Also in the BIOS, there is just SATA1, SATA2, SATA3 and ESATA
Where are the SATA4 & 5? How to get that in the Bios?
Do i have to change my bios? Are there any software to change bios completely?


Please guide me,

Thanks and regards
cingo

I have doubt here " are you saying when the hdd and writer are connected than the bios doesn't show the sata 4 and 5 "

or without connecting any attachments there is no sata 4 and 5 if this is so then you might wana check out your MB to asus center Mr.cingo


and if above first is the one than try connecting with 2 hdd and a dvd writer?

How much Hdd storage support is possible on MB find out?

Is your PSU compatible to drive entire system? good luck!