Sony Ericsson K750i Problem

[drowsy]

Hi I have just bought a new 4Gig SANDISK Mem stick pro duo to use with both my PSP and K750i. I already have a 2 gig and works fine with both.

When I bought the 4Gig I immediately put in in my mobile and worked fine. Then put it in the PSP and worked too, but now if I put it back in my K750i it wouldn't read it again. Even if I format it through the PSP on the computer, it still wont work on the K750i.

I also tried switching the mobile off, put the 4Gig in the K750i and switch it on, the mobile will just hang and in order to start up I will need to remove the 4Gig mem.

Any help how to make the 4Gig work again on the K750i ??
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A8N32 SLi -Deluxe
AMD64 3700+ @ 2.20Ghz
8600GT 512MBS PCI-E DDR2

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