My Dell Insprion sometimes starts normal and runs fine. Sometimes it does not start untill I turn off the power strip and hold the computer power button until it glows orange then turn the power strip back on. I replaced the CMOS battery, I removed all the memory accept one module and the video card, cables and fan connections and replaced one by one.Each time I replaced something and started the computer it took longer to start each time. I have run the Dell diagnostics on the mother board with everything installed all was Okay. Could the problem be the Power supply.