Hello, everyone. Firstly, my apologies for posting something completely off topic, but this list has always been a good place to turn for just about any problem in the past. Please feel free to mail any replies directly to me so that everyone else on the list doesn't have to be bothered by them. So, what's my problem ? I am trying out a little experiment, and it is not going as smoothly as expected. I am attempting to run a Tyan Tiger 100 rev. F (S1832DL) motherboard with a pair of PIII-667EB CPUs. This is a BX based mobo, and as such, it is only intended to run at 100MHz FSB. The EB CPUs run at 133MHz FSB. The board has been running for a few months now with a pair of PII-333s, and has proven to be rock solid. In addition to the two new CPUs, I invested in a 256MB PC133 DIMM from Crucial (does anyone believe how cheap memory has gone in the last month ?) and a Gainward GeForce 2 MX video card as they are supposed to handle the overclocked AGP port better than my old Viper V770. The Tyan BIOS is at 2.0.02, and has supported up to 133 FSB since about v 1.18, at least as far as the "CPU Speed" list in the BIOS itself says. Anyway, onto the actual problem. When I install the new CPUs, the machine does nothing more than blink the hard drive and power lights in sequence. It seems to do nothing more than try to start, fail, and then try to restart again. I have tried running it with just one CPU; same thing. I took out all the PCI devices, wondering if the board was not doing FSB/4 to get the right PCI bus speed; no difference. I know the memory is good as I left it in the machine. It is running right now, quite happily, with my trusty old PII-333s. Have any of you managed to get a configuration like this to work, or do you know of any websites that have any further info on this ? I found one that made mention of someone running a pair of 600E CPUs (100MHz FSB) overclocked to 800MHz by turning up the FSB to 133 in the BIOS. I bought the 667EBs and PC133 memory so that I wouldn't actually be overclocking those, but only overclocking the BX northbridge and the AGP slot. Any help would be much appreciated. Thanks, Stuart.