PC won't boot up but Ok on restart

I have a HP touchsmart pc running Vista. When I turn it on the initial "loading windows" screen has bands of virtical dotted lines all across it - the screen then goes blank. When you turn the power off (which is the only thing i can do) and re-start it general boots ok if I use the "Start windows normally" option rather than the "repair" option. Once running I can re-start it no problem at all.  (having said that I failed to boot it all last night)
I have Norton running so I don't think it's a virus... I've reinstalled factory settings and down loaded all the windows updates so I don't think its system software that's corrupted and Ive tried all the diagnostic tools that came with the pc...  it works fine once this is done - restarts on numerous occasions but when you shut down and turn back the same issue occurs.
An expert on another forum said he's seen a similar problem and that there is a fault on the GPU on these macines ?  and that HP have extended the warrantee to 18 months??  Not sure who to contact tho?
Please help it's only 15months old!!
Thanks

It sounds like a faulty Ethernet card, or network settings on the PC. When it boots, it will try to obtain an IP address, while it is doing that, it will be stuck on the desktop.
It may be worth checking your network settings to make sure that its set for automatic IP.
As an experiment, could you please set a static IP address on your PCs network adapter, and see if it fixes the problem.
Please see
Using static IP addresses on your home network
This will mean that the PC will be able to carry on booting, as it will already have an IP address.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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