I'll try to streamline this explanation as much as possible. I have an HP Pavilion all-in-one desktop that is just over 13 months old. Early last fall, it began having BSOD errors that were random, though infrequent. I did a few system restores shortly after they began, but it didn't fix the problem. Over the course of a couple months, the problems intensified and I began attempting to square them away with HP tech support through the warranty. I've gone through numerous troubleshooting steps including updating drivers, diagnostics and a full system recovery (three times now in total). On the second attempt, I received a Code Purple error, which finally convinced HP to take in the machine for service. They re-tattooed the motherboard and fixed the Code Purple, but never fixed the original BSOD error (by this time I was pretty convinced it was a hard drive issue). In any event, before these BSOD errors, I'll usually here a couple of clicks and a weezing sound as if the hard drive is sputtering. Usually within 30 seconds of that noise, I'll get the BSOD error. The computer will shut down and often it won't reboot for several hours after, showing a "operating system not found" message. I've been fighting with HP to get the problem fixed. They kept having me do more troubleshooting even though I was convinced it was a hardware issue (but they couldn't come up with anything from diagnostics). Finally after the warranty expired, I called back but then they tried to pull the "out of warranty" card on me. After some gentle pleading (read: yelling) they took the machine back into the service center and replaced the motherboard. However, I just got it back and it's still acting up. I think it's the hard drive and they're going to take it back into service, but frankly I don't trust these folks to fix it. So in the event someone here can make better sense of things than they can, I've attached the unique BCcodes I've received over the past few months and attached the crash dump files. Problem signature Problem Event Name: BlueScreen OS Version: 6.1.7600.2.0.0.768.3 Locale ID: 1033 Extra information about the problem BCCode: f4 BCP1: 0000000000000003 BCP2: FFFFFA80041E7550 BCP3: FFFFFA80041E7830 BCP4: FFFFF80002B865D0 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 BCCode: f4 BCP1: 0000000000000003 BCP2: FFFFFA8005534060 BCP3: FFFFFA8005534340 BCP4: FFFFF80002B915D0 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 BCCode: 1000007e BCP1: FFFFFFFFC0000006 BCP2: FFFFF8000292668A BCP3: FFFFF880009A9808 BCP4: FFFFF880009A9070 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 BCCode: 7a BCP1: 0000000000000020 BCP2: FFFFFFFFC000009D BCP3: FFFFFA800419F078 BCP4: 0000000000000000 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 BCCode: 6b BCP1: FFFFFFFFC000009D BCP2: 0000000000000002 BCP3: 0000000000000000 BCP4: 0000000000000000 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 BCCode: 7a BCP1: FFFFF6FC40007008 BCP2: FFFFFFFFC00000C0 BCP3: 0000000044A8F860 BCP4: FFFFF88000E01000 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 BCCode: f4 BCP1: 0000000000000003 BCP2: FFFFFA800537EB30 BCP3: FFFFFA800537EE10 BCP4: FFFFF80002D7D2D0 OS Version: 6_1_7600 Service Pack: 0_0 Product: 768_1 The latter one (F4) is the most common. It's happened the most frequent of the listed errors. These are the ones I've received since the drive was last re-imaged in January. There has been a total of about 30 crashes in these 3 months plus. I believe I have attached the necessary information. Thanks in advance for all your help!