Studio Spot 250 that strikes but doesnt "hold"

Hi all, I wonder if anyone can help.
I've been given a Studio Spot 250.
Everything works fine, except the lamp.
It strikes (flashes as if to start up) and thats it.
I have access to a second fully working unit that I've been swapping bits from to test - and ive diagnosed its a problem on the mainboard/logicboard/motherboard/whateveritscalled! - 100% sure. - and yes, I've reset the lamp hours.
I just wondered if anyone can help me!?
PS. I have a budget of about 10GBP - so repair is obviously a better option than replace.
Thanks in hope!
Andy M
(all these parts have been tested connected to another mainboard/unit -
Ignitor
Capacitor
Ballast
Lamp
Loom
Bulb connector)
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