Hello! Since yesterday I've started experiencing freezes, crashes and approx. 3-6 bluescreens - all while playing games. However, it seems some games are unaffected, while others are giving me a hard time. I started investigating and found out that my PSU-fan has stopped working (or stopped spinning). However, I'm not sure if it's even been working before, I'm assuming it have, as my computer is at least a couple of years old? Does the PSU fan have an own cable that needs to be connected to the motherboard, or should I assume the fan is actually dead? The mobo-manual indicated 2 connections that the PSU needs to be plugged into, and they both are - so my conclusion on that one is that everything is hooked up as it should be, since I can't see any "loose cables" hanging free from the PSU (apart from HDD and PCIe cables and such). My system: Asus A8N-E nForce 4 Ultra AMD Athlon 64 3500+ Sapphire Radeon X800GTO Fireblade ed. Western Digital 200GB HDD 2x512MB Ram Antec Sonata II Miditower, with supplied 450W PSU* WinXP Pro SP2 Realizing the PSU-fan might be dead I tried using SpeedFan to check for I-don't-know-what, but everything noticeable there looks normal, except my HDD which is at 51C, while all other temperature-indications lie around 30-40C. Is a HDD-temperature of 51C something to worry about? If so, would the solution be to install a new fan? And once again, if so - where exactly does one install a HDD-fan? Cooling has never been something I've really messed around with alot, neither has PSU's as you probably can tell. Would it be so simple as to somehow(?) fasten a fan to the HDD-compartment(s) of the Antec Sonata II? Lastly, I've started considering upgrading. Thought about replacing my X800 with a 8800GTS, and perhaps throw along an extra 1GB stick, along with any new PSU I might end up needing now. I've also read that the 8800GTS requires a 450W PSU, correct? Also, would this upgrade be "smart", or should I consider something else? (Mainly after gaming-performance, and also doing video- and image-editing.) So to sum it all up: 1: PSU-fan. Can it be a connection-problem, or should I consider the PSU "dead" (or soon to be, from cooling-issues?)? 2: HDD-cooling in an Antec Sonata II? Is it necessary at 51C, and what's the best (cheapest, easiest) way to do it? 3: Upgrade. Would it be wise to upgrade from my current setup to a 8800GTS, and perhaps an additional 1GB ram, together with a new PSU? With "wise" I mean, will the performance-difference be big enough to make my current setup appear somewhat/extra puny? =) And what PSU-wattage is needed in the case of that upgrade? (The alternative would be to buy more new parts and re-use some of what I have now, but I'd rather not spend that kind of money right now) I'd be grateful for any answers or tips you may give me, thanks!