urgent help required

[rahulshah19]

hi guys
I know this might just look like a common problem but I have tried everything so solve it.So plz help..
My computer boots up properly but when Windows starts loading I get a siren kind of sound and the system shut downs.It happens in my Windows XP as well as Win Me.It does not happen everytime,but there are times when I am working and the system suddenly hangs,gives the siren and shuts down.
I tried a substitute SMPS,cleaned up CPU fan.Tried with a different hard disk.But the problem persists.
Urgent help required.
ps:I would also like to know where can I get a free hard disk recovery software.

[digiFriend]

there can be many problem maker, mother board or ram can also be culprit.
if you have 2 ram, try only one, and see that its happen or not.

free data recovery software
Restoration v2.5.14

Description: Restoration can help you restore files that are deleted accidentally, even if they are no longer in the recycle bin or were deleted while holding down the Shift key. The program also has a function so you can make it almost impossible to restore deleted files, which you can use for deletion of confidential documents, for example. Works on all versions of windows.

file size: [193kb]