Sound won't work at all

[REISCOOL]

I have a new HP vs17e monitor with internal speakers and an old Gateway ATXSTF FED Performance 1000 tower. my problem, is that when i installed the new monitor, the computer won't respond to the internal speakers, and when i try to hook up the old external speakers i recieved with the tower and old monitor, they do not work either

my computer's current stats if needed:
Intel Pentium III processor
Windows ME op. sys.

[rpicardi1]

Assuming nothing else has changed;

1. Check that the correct connection has been made to the three color coded sound plugs in the back. (Mic or aux in, stereo out, quad out if your sound card supports it.)
2. Motherboard or sound card?
3. Did the mute button get pressed on the keyboard?
4. Is the volume control turned up on monitor? Also check the keyboard one.
5. Is the Preference set up correct for sound output?
6. Did you lose the software driver for the sound card?
7. Is the sound card seated properly?
8. Did the internal connector for sound come loose?

[REISCOOL]

1. it is
2. ??? I think it's soundcard though
3. Yes, only because i hate the only sound the speakers make, which is a fizzing sound
4. Yes and Yes
5. Where do i do that at?
6. I don't know
7. As far as i know it's correct
8. I couldn't figgure out how to get into the machine