how to purposely INDUCE EMI, noise, et cetera?? drill? phone? troubleshooting a GPU server, it has a card in it that generates a 20-100 MHz clock signal that goes to the actual GPU. Have worked on several of these units, when they fail the gpu doesnt get the clock signal so there is no VGA output. not really that important, but my question is, im trying to narrow down what the problem is, i want to induce lots of noise around the small coaxial cable going to the GPU clock, to try to get it to fail. sometimes the unit will keep failing, then you move some stuff around, and it works, theres not much rhyme or reason, and i cannot continue troubleshooting until i get it to fail again. noise wise, i have suspended an AC black and decker drill locked on full speed above the coaxial cable, and internal cards. loaded the power supply with all kinds of fans, heated the circuit up with heat gun, chilled it with air duster, shoved cell phones inside of it that were making calls, nothing seems to get it to fail consistently. I am looking for ideas on how to get it to fail, how to add more noise. any suggestions are greatly appreciated. at this time i am not looking on other means to troubleshoot the unit, because most have been exhausted now, by several people, over a few month time span. i do not have access to any test equipment to help, but even if i did i still have to recreate the problem. thanks!