fastest way would be hopping on an express bus or self drive down to SG to drop by their service center for warranty claim
but that was the fastest way for 3RROD claim la, as they give you a one to one replacement, not sure how long about the slim one tho..

GH provides the claim service with some charge, and you might have to wait up to a months time according to some forumer that previously use their service

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Added on August 17, 2012, 10:15 amor maybe the HDMI display setting is the culprit?
have you tried holding the power button on the console until it boot up to reset the display settings?

This post has been edited by greyshadow: Aug 17 2012, 10:15 AM

have you tried other HDMI devices to your TV? PS3 also same?
could be TV setting tho...