SE M600i theme error

Hi,
I have a sony ericson M600i cell phone and I have a problem with it,
I recently instaled a theme on my phone and it give me a strange error , I restared my cell phone but it wont boot up my M600i freez at the sony ericson logo please can you provide me with the keys combination to hard reset my M600i I dont have the usb cable to flash the rom , so I need the keys combination to hard reset my M600i as soon as possible.
please help me
thank you

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salut
. J'ai Le meme souci en soi moment si quelqu'un connait la solution je suis preneur également merci