By the way...terrible tragedy :amazed:
Perhaps a wise thing to do is first remove all uneccessary hardware, internal and external. That way you won't risk enforcing any possible damage, or any further damage to unknowingly broken equipment. Also, you can focus on the real, system dependant hardware.
So just leave your GFX Card in, RAM, Hard Drive and CPU. Remove everything else, including any optical drives.
Ok, the next thing to do is check to make sure that the voltage selector switch is set to the correct UK voltage (probably is, but if it wasn't on your first boot then doom).
Try booting the system again, with just the bare setup. Standby the power switch!!! But not too close...or you might not be able to respond to this thread! If the system is not booting still, then try the following...
Boot without your HDD plugged in. So no molex connector or IDE cable. If your system still doesn't budge, try resetting the BIOS CMOS chip. Try again...:grind: (few)...
Nothing!? Still!!?? Then it's either your Motherboard, Graphics Card, CPU or RAM. Check to see if your CPU is fried!!! Any black, brown marks, melted PLASTIC..? You might need to re-apply thermal paste after a positive inspection.
Still no success!!!??? Umm....ok try alternating between just one DIMM of RAM (i dunno...an idea maybe!?). Inspect those too!
If still nothing, blank, dead...Then I suspect your Motherboard. But then it could be your graphics card or CPU. Only way to tell is by testing with other hardware components.