I Bricked my Htc Amaze any one Help please.

I was trying to upgrading my htc amaze to 4.0 Ice Cream Sandwich via Custom Rom.... Then Suddenly My phone Went off and when i Powered on it struck at HTC logo with 4 triangles in corner.. and i am also unable to go in recovery mode with vol down + power key.... and pc is decting phone with unknown device with yellow mark any one please help me out .............. Iam using Windows please help i love this phone
screenshot given below