Singapore investors, reeling from a slide in the Straits Times index lasting nearly a month, took heart and moved in on computer-related counters. The index rallied by 12.02 points to 1609.81. Wall Street was the engine that pulled Hong Kong stocks ahead, led by HSBC Holdings which regained HK$1.75 to HK$91, and the Hang Seng index responded with a rise of 39.99 points to 10,872.25, its first gain in five days.