Greefings all,\n\nIn brief, Cold Boot Good, Warm Boot Bad.\n\nDoes this behaviour ring any bells with anyone?\n\nThe PC has been working fine for three+ years, and about a year on\npresent PSU, but has started behaving badly.\nLately the PC boots up fine from cold, but when I do a warm reboot most\nof the time it doesn't reboot at all. The screen doesn't turn on, it\ndoesn't check the memory... Sometimes it gets as far as the point where\nit should beep and go into the OS... but it just hangs there.\nIf I leave it for a while ( 5 - 10 minutes) and press the reset button\nit will usually boot fine.\nIf I try and power down the system after a warm reboot by pushing and\nholding the power button, it doesn't power the machine down but instead\nhas the same effect as pressing the reset button.\nIf I pull the plug and leave it for a minute or five, it will reboot\nfrom cold.\n\nIt's really like the thing has to cool down before it restarts...\nWhat could it be that's too hot to reboot?\nAnd why has this issue kicked in now when it's been working fine for so\nlong?\n\nI have checked (and cleaned!) the CPU heatsinks and fans. Reseated the\ncards, changed the PSU, reseated the RAM.. what else?\n\nDoes this behaviour ring any bells with anyone?\n\n\nCheers\n\nMark\n\nTyan Thunder K7 2 x Athlon MP2600+ 2.5GB ECC RAM Quadro 900XGL DVStorm2\nHercules Soundtheatre 4 x SCSI HDDs 2 X Pioneer DVD-R Adaptec 2904 SCSI\ncard for DLT drive TAGAN 480W PSU.