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Could be many things - I know, bad answer. There is no simple answer or fix.
Without more info one can only speculate.
Please determine and answer as many or all of the following so that we can help.
1) What is the make and model number of the Surround sound unit?
2) What is the make and model of the DVD player?
3) How is the DVD player connected to the Surround sound unit?
3a) Is it connected via an HDMI cable?
3b) Does the DVD player have regular stereo connections that you are using (we call these analog audio connectors)?
3c) does the DVD player have digital audio outputs that are connected to the Surround sound receiver?
4) Did the DVD player EVER make sound?
4a) if yes - what changed?
4b) if yes - does this happen with different discs?
Now some general points.
I'll assume that the other sources do work and play sound through all speakers when they are supposed to play sound through all speakers.
Then - I'll assume that without changing anything else you select the DVD player input that used to make sound but doesn't now.
Problem could be the encoding option that you have selected when you play the disc.
Many DVD's and Bluray's have audio options that you can select from the disc's main menu.
Dolby digital is the most common - also known as AC3.
Some discs have another digital audio track called DTS.
Not all surround receivers can decode all formats.
Even if your surround receiver claims to be able to decode AC3 and DTS, they will not if you don't connect the correct cable to the receiver and usually map the input to the correct digital audio connection that you are using OR if your DVD player is not capable of outputting all formats.
There are many different ways to connect the gear and many different ways one can configure correctly or not; all contributing to whether you get sound or not.
So in the above example - by selecting DTS, you do not get any sound - then try another audio track option. Basic stereo usually works (also know as PCM - which is audio like a CD).
OR maybe you never properly configured the audio properties of the DVD player.
Go into the DVD's menu or set up options and see what you find but make sure you know how the DVD is connected to your surround receiver!
As you can see - there is no simple answer without a lengthy Q and A exchange first.
If the audio works good otherwise (you can play some Windows sounds or go on Youtube and play a clip), then you likely have a partially bad DVD drive. I've seen partially bad DVD drives that had done exactly that. Don't know what model HP you have, but HP usually puts out its service manuals on its website and getting a DVD dive replaced yourself shouldn't be overly difficult. Best place to buy a replacement drive would be on eBay, and anything other than a DVD-write should be pretty cheap ($10-$20); DVD-writers cost slightly more.
You can check your dvd player for a coaxial or an optical sound output, then you can plug it directly to your receiver. Those two are the best options after HDMI. Another option is A/V RCA type cable, you´ll need 3 stereo A/V wires, in order to connect the 6 channels. Remember to uncheck the HDMI sound output option on the DVD menu.
Please install the drivers of your computer, the chipset,vga, audio driver. if all of this driver are installed and did not video did not sounds, maybe you need a player. install the mega codec player and play DVD on this player.
Are you sure your player has got the right codecs to play both audio and video of the DVD you have burnt?
PS: Try installing the Ace Mega Codecs Pack just to make sure you have all the codecs. (Remember though that this software will install all the required codecs as well as the unneeded ones...the ones maybe required in the future probably)