Hi All, Every now and again when I turn pc on it goes through all the usual things including one beep, but, no picture on screen. I am using IGPU setting in bios and I do not have a graphics card installed. Have checked all usual things like mem reseating I have latest bios etc. Any ideas please. P8Z68-V PRO, 2600K, 8GB Corsair mem in two sticks, NZXT 750 W, OWC Extreme SSD 120GB