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Yeah, it does take a while, but once it's done once, you don't need to do it again. The second tuner will just use the same channels if you set the video source to the same

Google is your friend my man
http://www.mythtv.org/wiki/index.php/Hauppauge_WinTV_Nova-T_500_PCI

It would appear that this is due to a fault with the latest nVidia driver (100.14.19). By the looks of it nVidia are on the case
http://www.nvnews.net/vbulletin/showthread.php?t=98852

I actually gave up and decided on a straight MythTV setup using Fedora 7, with all the MythTV extras.
Once Fedora had updated itself, and mythtv was installed I had it up and running problem free in less than a day.

I'll probably try again with LinuxMCE at a later date

Here are some photo's of what's happening on mine.
This happened when tying to watch TV after viewing a video file from LinuxMCE

What I get is either a totally pink screen, or a random mixture of green and yellow pixels. You can sometimes make out shapes, like the info bar on mythtv, but only because there is a definite block of randomness in that shape.
Sometimes, but not often, the window in which it's playing shrinks to the top left corner, and displays a pink block. This usually causes the machine to totally lock up, and I have to power down.

I can take some pictures if it'll help?

As I'm sure you can imagine this makes the machine pretty much unusable for anything other than TV, so if anyone has any suggestions I'd be very grateful.

Here are some other problems I've noticed. They may be unrelated, but it's possible they'll point to something.

1) After using MythTV there are random black boxes in my video library, even when I have no recordings. These go away after a reboot
2) When using MythTV, pressing F7 to show the LinuxMCE GUI will cause a total loss of signal, which can only be fixed with a reboot.
3) If a MythTV recording is in 4:3 ratio, it will be displayed as a box in the middle of the screen when watched back, as if it needs zooming in.
4) Frequently (70%-80% of the time) when using LinuxMCE's GUI to select chapters on a DVD, selecting my chosen chapter will simply send me straight back to the begining of the DVD (Usually the copyright notice)
5) If I rip an album with a lot of tracks on it, I can only select the first page of tracks, there is no way to scroll down the list to the next page (As you can with say movie chapters)

The tuning problem you're having sounds exactly the same one that I had when I first installed the Nova T 500. I couldn't get it to tune at all, dispite showing signal strength well into 80%. Once I followed that wiki page however everything worked as expected.
I am experiencing a MythTV problem however, in that I can open it, and it'll work fine, but I then can't leave MythTV and view a video. They all show up as a garbled mess regardless of the prog I use to view; audio however is fine. Linux mce, Xine, even MythTV stops working from that point.

Ok, another observation. After watching TV, if I decide to watch a DVD or stored film, there is always at least one, sometimes 2 or 3 blank boxes which are showing up as videos. They seem to be in the same folder that TV shows are recorded in, but I have no recorded TV prog's.
Usually if these are present, you can pretty much forget about watching a film, because clicking on one will again just bring up a scrambled mess, and on occasion it will even totally freeze the machine.

Something that has happened to me twice now is, when watching TV, F7 brings up some options on the LinuxMCE GUI. Guide, off, etc. However, on pressing F7, MythTV looses signal lock, and won't regain it unless I reboot. When this happens the stored Videos also mess up as before.
Perhaps this will narrow it down.

Well, I was introduced to this guy by my local electrical wholesalers, who are also looking into the whole media centre genre. They didn't realise how much of a mark up this guy was adding, and were surprised when I told them that I had got the same system up and running for only a few hundred pounds, with help from a linux savvy friend and this forum of course.

In fact, they most probably browse this forum, as he actually told me about the Wiimote project that is being worked on currently. (Very interested in that too BTW!!)

Apparently when the wholesalers told him what I had managed, he had a go at them for bringing a 'programmer' in to steal their work. I'm sure you can fathom from my posts that I'm no programmer

As for the C-Gate. I know you can get an rs232 interface, and if they want you to have it, they will send you a developers pack. But I'm not sure what you need to do to qualify for one of those

Quite frequently I will try to play a video or watch a tv broadcast, only to find that the sound is fine, but the video is totally messed up. It's as if there's some sort of codec missing. A reboot will normally fix this, but it happens so frequently that it's not really an option to just keep rebooting.

Once it happens it affects Xine, Linux MCE, and MythTV.

Anyone got an idea what could be causing this?

Cheers in advance

OK, guys, cheers for that. Hopefully I should have a half decent setup by tonight.

I mean the full AV Wizard. I'm moving the machine to my living room, where I will be using a TV connected to S-Video rather than a monitor connected to VGA, and a propper Dolby/DTS amp throught the spdif instead of PC speakers through the 3.5mm jacks, so I could really do with setting the whole lot up again.
I couldn't see anything in the advanced screen using UI2. I'll go and have another look

I can't seem to login over a network. Firewall settings perhaps? Is there a firewall?

I'm currently using this board. Every step of the installation has required some software tinkering, but this is my first ever linux install, and I'm begining to realise that's normal

Only thing that I have noticed is that the motherboard doesn't seem to turn off when the PC is turned off. There is always a light on the motherboard, and my case has a VFD screen which connects to the motherboard power lead (A small 3 pin lead off the main plug), and it's constantly lit unless I turn the PSU off at the back. I've had to unplug it for now because it was getting annoying.

Dragging up this old post, is there a way to do it safely without pressing left shift on the tones? I have no speaker on my motherboard, so waiting for a tone isn't really an option. I've tried rebooting and guessing when to press it, but to no avail.

The option to do this from the advanced section of linux mce would be far more user friendly