I've dealed with comuter hardware for many years, but haven't seen such strange things happening!

Well, all began from installing a new videocard in Computer1:

m\b ASUS i965 , proc 6320
4gb ram
gf8800 without outer pci-e power supply connector
samsung 120gb spinpoint hdd sata 1 7200rpm
seagate 200gb sata2 7200rpm
seagate 640gb sata2 7200rpm
400w hipro power supply

So, I installed a new video card ASUS EN9600GSO Magic with external pci-e power connector and booted OS. When I heard strange noise from HDD I started diskcheckup and saw that Raw Read Error Rate, Seek Error Rate and Hardware ECC Recovered are in very high values (more that 1000000). I switched off Computer 1, unplugged 640Gb hdd to take it home and plugged in an old video card - but when the system started, I saw that the SMART values raised again an all HDDs.

Then I plugged my 640Gb Seagate in my home Computer2:

ASUS nf570sli with 4600x2
4Gb RAM
gf7900 512b with external pci-e power connector
550w ASUS PSU
HDD samsung spinpoint: 400Gb sata2 and 1Tb sata2

And what a surprise - when I plugged it in all my hdd's began to produce starnge noise (as in Computer1) and their SMART values also raised and continue to raise every second!

Please help me to solve the problem!

640 gb drive broken that cause psu problems. No comment about system 1 and the 400w psu...

What psu do i need to run all hdds?

I need to say: all hdd utilities checked up the disks and wrote "OK" about them...

Then thoroughly check the system : the noise maybe comes from other source rather than HDDs. This is more a computer shop case than a HDD issue.
Of course, if and only if at computer shop you find a decent expert... usually they go for "let's change this... no, it wasn't.... let's try this.... no ? ok, let's try this other.... I know a trick....on the internet there's plenty of bulls...er, information.... a forum !.... another forum !!...." and so on.