I have a nice Dell Dimension E510, runs Pentium D's, chipset Intel i945P/G. I received it stripped down and suspected of malfunctions of some sort. Installed an Enermax 550 PSU, and 2 x 256 mb = 512 mb of DDR2 ram, ram tested fine. Installed Pentium D 2.8 ghz, 800 mhz FSB, and an amazing 4 mb of L2 cache. It used to run OK on Linux, but after a while it would begin to restart for no reason after having booted all the way up. Seems to have gotten worse, now it won't even start to boot. The HDD tested fine, put in a different HDD and same results. Friend said he thought it was a bad PSU, I was doubtful because it was a stout Enermax 550 that runs fine in other computers. Put that back in my P4, bought a new Antec 450 watt continuous PSU. It runs fine in the BIOS, however the only thing it will boot into now is memtest. The second it starts feeling a load while booting from the hdd or DVD rom drive in 32 bit DSL Linux, Ubuntu 7.10 very light linux, LinuxMint 7, LinuxMint 11, Win 7 safe mode, or 64 bit LinuxMint 10, it immediately restarts. From the DVD rom drive, LinuxMint 10 64 bit, and LinuxMint 11 32 bit, after it just starts booting it stops progressing in the boot. The light weight Ubuntu 32 bit 7.10 cd live disk boots to the menu (like the others) then when I press enter to boot 7.10 the DVD drive really spins fast as it starts to boot up, then the computer resets.
Don't have a temperature reading. All the capacitors look good, that is nothing deformed. Any suggestions?