For some months, I left my PC on 24/7. September last year, I found the PC wouldn't start from cold. I thought it was a glitch, but had the same problem at Christmas, so obviously not a glitch. The symptoms are these: Switch on PC. Monitor stays blank. No lights to show any drives being accessed. Not getting as far as BIOS, by the looks of things. I can hear the system fan going, but that's about it. After a few minutes warming up, CD drive lights flicker. At this point I power down, wait a few seconds, then switch on again. I have to repeat this a few times to get the PC to start. Once I've got the PC to start, everything seems fine. Things tried: Vacuuming inside of PC - no effect Ensuring cards and RAM are correctly seated (cleaned edge connectors) and all cables are firmly attached - no effect Replaced battery on mobo - no effect (*more on that later) Tested RAM - tests out OK *I replaced the mobo battery for two reasons. Firstly, somebody said it might be causing my problem; secondly, the PC clock lost time while the PC was off. When I turned the PC off recently, I found the clock was still losing time - 43 hours over 10 days (the calendar is now 1 day out). PC Spec: AMD Athlon 1.2 GHz CPU, Chaintech CT-7AJA mobo, 128Mb RAM, SoundBlaster 5.1 Live soundcard, nVidia GeForce2 graphics card, 40Gb hard drive I have not added or changed any hardware since the problem occurred, nor did I add or change anything immediately before the problem occurred. I don't have access to a second PC so I can try swapping things to try to find the problem. I can't afford to take the PC to a repair shop, which is why I'm here - free advice! That also means I need an answer that doesn't involve replacing bits 'on spec.' to see if that fixes the problem. Please help!