I had a power outage recently. Afterward, the PC would not power up. Thinking the PSU got zapped, I swapped it out, but when I turned it on I got no post, no beep code, or keyboard lights. I cleared the cmos, swapped with extra ram I had Etc. All the fans spin as well. Also, in two different cases have the same issue, Power will turn on with the power button, but will not turn off when the power button is held in.
So I ordered a new MB off newegg as well as a new PSU. When I got it today, I mounted the MB, CPU/heatsink, RAM, and PSU all installed. Turned it on, and same exact issue, this using a brand new MB and PSU! After letting the New MB run for a few minutes with all the fans running (including CPU fan of course), I shut it off, and removed the heatsink/fan from the cpu. It was the same temp as when I first installed it in the socket. Would this be a good sign that the power outage friend both MB/CPU?
Well, actually it was two boards that zapped in the unfortunate power event. I ordered two Biostar AL780 boards. The CPU's I have are a Semptron 2700+ and a Athlon 3000+ Dual Core. Trying both processors in the new boards exhibit the same behavior (no keyboard lights, no post, unable to power off the pc via power switch, either cpu doesn't generate heat on either Biostar AL780 I ordered. Odds of two bad boards...not too likely. I get the same behaviors with those CPUs when trying them on the old boards too
PSU I ordered is Logisys 480Watt. But I have another 400watt PSU that I tried with the new boards and exhibit the same behavior. I've tried 4 different 1gig DDR2 chips. I'm ordering new CPUS tonight as well. Would it be safe to try the new CPUs in the old boards (Gigabyte), or should I not chance it? This whole situation stinks, as I've never had such major components die, so I was always able to troubleshoot and fix most issues. Without spare CPUs that was kind of difficult. If I try the new CPUs on the old boards, and it works Newegg said they will RMA the boards with no re-stock fees. But I a leary about sticking the new CPUs in the old boards.
Slim change of two bad boards. Are you sure that you have the correct socket? Sempron 2700+ and athlon 3000+ do not sound like socket am2+/am3 CPU's?
What is the model number of your original Gigabyte board?
Ok those should work on the new boards! It is unlikely that both CPU's are bad since you only had one in at the time of the incident. Did you follow the guide I linked to before to see if you forgot anything like a CPU power connector.