SZ seems dead, can't get to bios, screen blank... help?

Hopefully this is in the right bit of the forum.
I've looked but can't find the diagnosis of my faults...
Which are these:

Led's flash and starts up, checks dvd, then goes nowhere.

Screen stays black.
No bios, and no vaio bleepy noise thing.

When it died it had fuzzy lines across the screen in two bands and froze.
Rebooting got half way into windows when the same happened.
Since then it is dead basically.

In the past the screen went dark and I replaced the daughterboard, since then no problems until this.


As far as I can tell it's the motherboard that is broken, or the graphics card on the motherboard.
Is 'reflowing' the graphics card worth a try?
I suspect I'd just ruin it all more but seemingly out of options.
Any advice most welcome!

Daniel

It's a sz-2xp/c