Waiting time to change the CPU?

[oops]

Hi all the title says it all really I was wondering is there a certain amount of time to wait after powering down the computer before changing the cpu as I seem to have fried two processors in quick succession, one last night and then another one today I was testing an old cpu last night (amd 1500+)and so I powered down the computer and waited a min or so removed the psu lead and lifted the heat sink and fan lifted the securring arm and replaced the working cpu with the old one checked it but it wasn't working so I powered down again and replaced the old cpu with the original added a little thermal paste replaced everthing and rebooted but nothing, so I tried my post card in an pci slot but nothing no codes. Fried!
Today was much the same I was cleaning my sons computer so I thought Id try the original cpu from the machine last night and added a little thermal paste but nothing, so I replaced the cpu again (amd1800+) powered up and nothing again I tried my post card again and this time Im getting these codes :- C1C0, AAC1,and C2AA but nothing else no bios no beeps nothing, so Im thinking I maby changed the cpu to quickly and fried them? Anyone any ideas!

 

[bigsharn]

Sounds to me like it's your motherboard that's knackered... Do either CPU work in your son's computer?

 

[Noto]

Before touching any computer components touch a radiator, it will earth you and take away any static charge you have.

Keep the PSU cable plugged into the wall socket. But socket turned off and PSU turned off. Once both are off it may be worth pushing the power button. Sometimes there is residual power left inside the machine, enough to power a fan for 0.5 seconds or so.

 

[Yamahahahahaha]

Before touching any computer components touch a radiator, it will earth you and take away any static charge you have.

Better off washing your hands, the metal taps will be earthed at some point and it'll clean any grease off your fingers.

Those old Athlon chips had a habit of dying when you mounted them. (Lack of IHS ftl)
Not your fault, stupid design on AMD's part.

 

[Bonjour]

I'm a bit of an old fuddy duddy, but I usually wear an anti-static wrist strap when working on my computers.

 

[oops]

Thanks for all the replys guys, the funny thing is I was wearing an anti-static wrist strap the first night that I worked with the amd 1500+, but not the next day (lazy) any way the good news is I got my sons computer up and running again, dont know how I just tried it again last night and it worked Im very happy with that, so I tried the other cpu's in my sons and also had my post card in and none of them worked, the post card showed no-c (no codes) so Im guessing/hoping its the cpu that are knackered and not the mobo as Ive ordered a second hand 1800+(dont want to spend to much money as its for my sisters comp) to see if that works in the first machine and hopefully get her computer up and running.