Having problems with your Dell OptiPlex GX260 PC Desktop ?

Default IRQ settings...

\015 I was messing around with the settings (when you press F2) yesterday, and now, I don't have any sound. Is it possible that changing the IRQ settings caused it? What are the default IRQ settings?\015

Answers :

If you were just messing around with the keyboard, you have have just muted your audio output. You may even see in the lower right corner of your screen a red circle with a line through it over the volume control icon.
Laptop keyboards have function keys that let you mute your audio from the keyboard. Go into your control panel and click on the sounds icon, see if you have the mute box checked and uncheck it to un-mute your audio

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Default IRQ settings...

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