I have solved my problem ....
It's all about the PulseAudio, the new sound server in 8.04 Hardy,. Instead of that every application has its way to access the sound card, PulseAudio becomes a common (gate) to access ur sound card. The problem is that not all applications can deal with the new sound server. But it's getting better.
Regarding ur problem, apparently System Sounds have also a problem dealing with PulseAudio to get over it i installed "PulseAudio ESD compatibility layer" u can install it by opening a new terminal (Applications>>Accessories>>Terminal) and paste
Code:
sudo apt-get install pulseaudio-esound-compat
One last thing:
-Make sure that PulseAudio is configured the primary sound device (System>>Preferences>>Sound) and in the Device tab select PulseAudio Sound Server, sometimes it will require a system restart to work properly,
-Make sure that Software Sound Mixing is enabled from the Sounds tab in Sound Preferences check "Enable Software Sounds Mixing ESD"
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