Hi all, You'll have to forgive me, I'm not a computer whizz, I just enjoy tech and fancied challenging myself by upgrading my tower PC. I recently upgraded it from 4gb RAM to 8gb, I added in an SSD (keeping the old HDD in use for storage and constantly connected) and I added in a wireless card (god knows how I managed before!). I also have a GTS 450 graphics card and plenty of peripherals plugged in, including a printer, wireless mouse, keyboard, external Blu Ray drive, Xbox 360 controller for Windows. Gradually, my PC has started crashing more and more. It is as if the power cord is tugged out of the PC, the power just goes, it doesn't go to a shut down screen or freeze or anything like that. This leads me to believe it's a problem with my power supply, but that was only replaced a year ago! The shutting down is unpredictable and very frustrating, although it seems more likely to occur either a few seconds after turning the PC on, or during gaming. Could someone please offer their opinion on whether you think I should opt for a new power supply? I was looking at a £55 Corsair one from Amazon, are there any things I need to be careful of when buying/installing a new PSU? I am also looking at getting a new CPU, hopefully a Haswell i5, to replace my ageing Core 2 Duo. Would the PSU advice be the same for this CPU too? Specs: Windows 8 Pro 2.40Ghz Intel Core 2 Duo Quad Core Nvidia GTS 450 graphics card 8gb RAM 256gb SSD 1tb HDD Need any more info, just shout. Thanks very much for taking a look, I appreciate it!