dont know exactly how old but here's its specs:
operational system: windows xp (5.1)
processor: AMD Sempron (tm) 140, mmx, 3dnow, 2,7ghz
memory: 1920MB RAM 435GB external
pagination file: 611MB used, 3201MB free
graphics board:
ATI Radeon (tm) x1200 series
in half lif 2 when doc Mossman activates the elevator on east black mesa,the elevator arrives opens its doors but then nothing happens, i tried everything and i did it like 20 times, what should i do?