On the machine that wont boot. switch out the psu with a new one, I got an extra if you need(powersupply)
On your gaming machine, shut off any services you dont need, you didnt say what os you're running so Im assuming windoze based, xp mebbe? If you disable services you really dont need, the machine will run a bit faster for ya. Afterwards benchmark it, with futuremark compare your results to others... and read up on what they did...(search google *futuremark, benchmarking * gaming, overclocking)
Try powerstrip to overclock your video card. Get ram sinks before you do it and I'd recommend better cooling. You'll want better cooling in your machine overall. I dunno how much gaming you do, or how graphic intensive it is.... A cool case is always beter..... Its best to view results for other ppl. running the same card and take the average of what they oc'd their cards to, to avoid that burnt silicon smell, dont wanna overdo it
Check these guys out for reviews and how to's n stuff:
www.Virtual-hideout.net
For good prices on ram n stuff check out:
www.pricewatch.com
You just have to know EXACTLY what you're looking for and how much you would consider to be a fair deal AFTER you include the shipping fees.
If you ever feel like getting pwned playing UT99-2004 lemme know