Hi, I am having problem to boot the PC. Powers on, fans are coming on spinning on high, the DVD drive is not coming on (the light is off but I hear it spinn few times), I hear the HDD spin few times then stop, the power stays on, fans spinning happily but doesn't even go to Bios, the screen stays black. I have to say this strated to happen with my old mobo P5n, I thought that was it, I have replaced for p5q pro, did work fine for like week with no fail, then it started to happen again and then more often. Now out of 40 tries the PC will boot once, sometimes not even that. I thought , right, could be memory, swapped it around, tried one at a time, tried different memory but nothing. Thought maybe power supply, bought new one but still, so got the PSU tested but I have been told it's fine. Then I heard could be PCI, took the graphics out, tried different one but still. Tried different HDD but 0. I tried plugging and unplugging everything but no help there. I don't have the speaker so couldn't listen to the beeps. Also thought it might be shorting somewhere so I checked the chassis but seems fine, I heve unscrewed the mobo and let it sort of sit on one of those anti magnetic wraps and nothing. Got bored one day, took it to the computer shop for testing and the guy turned it on 7 out of 7 times, gave it back to me, told me I am crazy and charged me £20... I am thinking can it be the main socket so shall I buy something to stabilize? I am really running out of ideas, please give me some hope and something to try. It is really confusing because sometimes it will boot just fine (of course not when I need it). My specs are: PSU: OCZ 780MXS, MB: Asus P5Q Pro, CPU: Q6600, RAM: 2x2GB DDR2 800MHz, 500 GB HDD, GPU: XFX 9800gx2.