THE French master of hi-tech entertainment, Jean Michel Jarre, used the latest technology yesterday to hold a press conference in Hong Kong while he sat in Paris. Jarre, who will light up Hong Kong next week at the opening of the Hong Kong Stadium, was beamed into a Wan Chai office block to ''meet the press'' and do the traditional pre-concert publicity - with a twist. His image appeared on the massive video screen and despite the voice delays because of the distance involved in beaming the signal, he was still able to portray the message that his concert on March 11 would be BIG. The show which, according to him, will be a light and sound extravaganza, has had its ups and downs and at one stage looked like it might not go ahead because of the massive costs involved. However, a number of sponsors stepped in to help cover costs and Jarre agreed to waive his $5 million performance fee. ''We are celebrating Hong Kong that night, not Jean Michel,'' he said. Jarre is planning a special show which he says will be unlike anything he has done. It will include a laser show, fireworks and his special brand of synthesised music. Special permission has been granted for the fireworks display. Although he was not giving away too many secrets about the concert, Jarre promised some ''surprises'' and a show which took Chinese culture into account. He will be performing with a Chinese orchestra and choir to complement his own unique sound. Jarre entered into the Guinness Book of Records in 1979 when his first public appearance at the Place de la Concorde in Paris attracted a television audience of 100 million for his show. In 1981, he became the first international artist invited by the Chinese Government to perform in China following the Cultural Revolution. About 40,000 people are expected to fill the stadium for the show.