I have lots of History w/ BSOD before like IRQL NOT LESS OR EQUAL. They seem to have gone away after lots of diagnostics and such. Now the computer on bootup does not start, it shows a quick flash of a blue screen or shows this bsod http://i.imgur.com/82h6v.jpg, then boots up again. I start system restore, the computer works fine then I get the same problem again on bootup or waking up from sleep (sometimes.) Here's some Info. HP Pavilion Elite m9400t Operating System Microsoft Windows 7 Home Premium 64-bit SP1 CPU Intel Core 2 Quad Q6600 @ 2.40GHz 52 °C Kentsfield 65nm Technology RAM 6.00 GB Dual-Channel DDR2 @ 399MHz (6-6-6-18) Motherboard PEGATRON CORPORATION Benicia (CPU 1) 45 °C Graphics DELL ST2010 (1600x900@60Hz) 1024MB GeForce 9400 GT (PNY) 59 °C Hard Drives 488GB SAMSUNG SAMSUNG HD502IJ (RAID) 31 °C Optical Drives HL-DT-ST DVD-RAM GH15L Audio Realtek High Definition Audio Memory (Physical) Total 6143 Cached 1768 Available 4544 Free 2911 (Kernel) Paged 224 Nonpaged 62 Things I have done... HP Hardware Diagnostics System Test Passed. Avg PC Tuneup used may times. Uninstalled all my anti virus and installed Microsoft Security Essentials. Check Disk. Installed all drivers via. device manager. Updated Bios Thanks! Any help appreciated! P.S Should I get more Ram?