issue with SystemSounds and notifier Icon

I've got a portion of this program that has a timer setup. On the
interval I am checking to see if some stuff is changed then want to
play the exclamation sound until it has been noticed and acknowledged
by the user.
>
* * * * void flashTimer_Tick(object sender, EventArgs e)
* * * * {
* * * * * * if (pictureYes.Visible == true)
* * * * * * {
* * * * * * * * if (chkAlarm.Checked)
* * * * * * * * {
* * * * * * * * * * System.Media.SystemSounds.Exclamation.Play();
* * * * * * * * }
* * * * * * * * FlashWindow(this.Handle, true);
* * * * * * }
* * * * }
>
problem is, the sound doesn't play. I was also running into this with
the showBubble with the notifier icon. Is there something special I
need to do for this?
>
I've tried making the call in a delegate and doing an invoke, also
tried a begininvoke with no luck.