I just installed an ECS P5SD-B+ motherboard (from ebay,supposedly working)with an Award BIOS V 4.51PG.The CPU is an AMD K-2+ 450. There is 128 M of PC 100 SDRAM. I can't get it to run with any setting over 75 MHz FSB even though the CPU and Memory are 100MHz. The Bios screen identifies the processor as Unknown-S CPU @400MHz(It's set at 75MHZ with a 5.5 multiplier) The memory tests 131072K OK. Then it gives the Bios identification and STOPS. It doesn't identify any of the hard drives or the floppy so I'm stuck here. I've checked everyting ten times. What am I missing? Why can't I run the 100 FSB? Any input would be greatly appreciated.

Could be overheating and locking up when you try to boot. Did you make sure you have a good fan and thermal grease and or tape on the processer.?
However if its a k62 processer you dont need the thermal grease or tape.
Also could be a faulty powersupply.

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Murph's Law: 1.Everything takes longer than you think
2.If anything can go wrong it will
3.Nothing is as easy as it looks

Those 450's are picky little buggers. Do you have the voltage set correctly at 2.4 volts? Do you even have means of changing the operating voltage?

Yes, you do need some sort of thermal conductor, either tape or grease. Those 450's tend to run hot. Do you have a good HSF? Did you install it correctly, using something like Arctic Silver? Make sure you have adequate cooling. Make sure the heatsink is getting warm or even hot, which would signify that it's doing its job of transferring heat away from the CPU.

However, I don't think this is heat related, but of course I could be wrong. It's might be due to the FSB setting. No matter what setting you have the FSB and multiplier though, the BIOS should still recognize the CPU as a K6-2+.

Can you get into the BIOS setup at all? Have you been in the BIOS setup? Have you tried to clear the CMOS, either by using a jumper on the motherboard, or by removing the battery temporarily? If you have been in the BIOS setup, did you set the IDE devices to Auto? Did you try the Auto Detect Harddrive option?

Do you have a warranty on that motherboard?

Good luck.

Big Blue 66

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This space reserved for highly intelligent observations and witty remarks.

"From up on the roof top there came such a clamor, I ran to the window and threw up"
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Hey, go take a look at the site below. There is a very good review of your board, along with some good tips about memory timing using the JP9 and JP10 jumpers. Check it out!
http://www.hardwarezone.com/reviews/mb/p5sdb/p5sdb.htm

Good luck.

BB 66

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This space reserved for highly intelligent observations and witty remarks.

"From up on the roof top there came such a clamor, I ran to the window and threw up"
-- Tommy Smothers