Hey folks... another eMachines headache to throw into the mix just to keep things interesting. My parents have an eMachines T1742 that they bought about three years ago -- I was not too thrilled when they showed me their new computer, since they know I'm a tech guy (who knows better than to buy an eMachine) and they never consulted me about it. But I was off in college at the time, so no big deal, they just didn't want to interrupt my studies, I suppose... Anyways, over the past few weeks it's taken up the nasty habit of *almost* shutting down at irregular intervals. It doesn't turn ALL the way off -- the NumLock light is still lit on the keyboard and I can still hear a fan operating inside the chassis -- but the optical drive isn't getting any power, and the monitor, hard disk, and power light are all off. My first inclination was that my folks unknowingly enabled automatic standby or hibernation and the computer was having problems waking up, but a quick inspection revealed that wasn't the case. The power settings just turn the monitor off after a half-hour of idle time, but everything else stays on. I also checked Event Viewer, and there were no errors or warnings that would indicate anything out-of-the-ordinary. Then the computer "turned off" on me while I was using it, so that pretty much ruled out the "this only happens when the computer is idle" hypothesis. Knowing the issues that eMachines PSUs have, my next solution was that it had to be the power supply. I replaced the crappy stock Bestec 250-watt PSU with a 430-watt model from CoolerMaster. Unfortunately, the problem persists with the new PSU. The thing that stumps me is that I know the eMachines PSUs tend to take out the motherboard as well when they die, but I don't figure it's the motherboard since I've seen PCs with dead motherboards before. They just don't do anything, and this computer is definitely running fine until it goes into its strange quasi-hibernation state. The last-ditch things I checked were the case and CPU temperatures, which were both in the 30s (Celsius). Seems normal for a 1.7GHz Celeron. Here are the system specs: Processor: Celeron 1.7GHz OS: Windows XP Home Edition Motherboard: crappy Imperial board with Intel 845GL chipset Power Supply: CoolerMaster eXtremePower 430-watt (brand-new) Memory: 640MB SDRAM (upgraded from original 128MB) Hard Drive: 40GB Optical Drive: DVD-RAM drive (upgraded from stock CD-ROM) Video: Intel Extreme Graphics (on the motherboard) Sound: AC97 (on the motherboard) Network: 10/100 NIC (on the motherboard) Modem: old v.92 56K modem (came with the computer) Peripherals: eMachines keyboard, Logitech Wheel Mouse, Cyber Acoustics speakers (replaced the stock eMachines speakers) So... any ideas? My inclination is to just replace the motherboard and processor, have my folks buy a new copy of Windows, and set them up with a "new" PC (albeit in the existing case). But if anyone has actually managed to get a similar eMachines system back up and running after a problem like this, I'd love to hear about it so it could at least buy them some time to pick out new hardware.