Help. My daughters Sony P4 3ghz HT Vaio desktop has always had problems - mainly motherboard related but recently one of her two screens starting intermittently blanking out for a second or so. As it is now out of warranty I decided to try and salvage the good bits and put together a box that could last her for the next year or so. So I took the following existing bits out of the Sony Vaio - Pentium 4 cpu 3ghz hyper threading - 1.5 gb of RAM (2 x Kingmax 512mb DDR-400 and 2xProMOS 256mb DDR-400) - Sapphire Radeon 9600 Atlantis 256gb vid card - Hard drives and DVD drives - Dell 1905 lcd screens And added them to the following new components - Antec Sonata II case (with Antec 450 p/s) - Intel D965PERL mobo - and when that didn't work (see below) - ASUS P4P800-E DELUXE Socket 478 mobo - new 200gb hard drive Problem is that on both the Intel and the ASUS mobo, the PC powers up but nothing happens - the screen remains blank, no sound is emitted (e.g. no beeps under POST) and nothing happens. There is a momentary lighting of the lights on the keyboard (connected by PS2 or whatever that old non-USB connector is called) and the DVD drive will ight up and open/close but no boot screen etc. I did a quick search here and tried the following - none made any difference - swapped out the cpu for another (older) 478 P4 I have in another Vaio - tried a total of 4 different vid cards (and verified that 2 were working on other PC's) - tried removing then replacing all the components - tried various combinations of memory (1,2 and 4) - removed all other non-essential components and disconnectednon-essential cables (including IDE, floppy, etc.). Leaving only the following in an attempt to reach the initial boot screen: the motherboard, CPU, RAM, power supply, and graphics card. What am I missing? Is there some kind of compatability issue with Sony VAIO P4 cpu's - am I screwing up in some other way. I'd really appreciate any guidance or pointers - I'm dead frustrated right now. Many Thanks - and happy new year.