Ugh. Well I picked up a new power supply today, installed it, and now the original symptoms have returned. All fans on, no video.
I even tried switching the power supply with my wife's computer again, just to rule out the off chance that I got a bad one out of the box. So it seems that the power supply was a false cause. Something else, somewhat intermittent since it did boot up OK last night, is going on. I tried reseating the CPU and that made no difference. Allan Allan Streib <str...@cs.indiana.edu> writes: > Yep, good guess. I swapped in the power supply from my wife's computer > (hey, it's HER dad, right?) and his computer booted up just fine. > > I'll pick up a new power supply for him tomorrow. > > Allan > > Peter Frederick <psf...@earthlink.net> writes: > >> Fans are 12V, not 5V, and for whatever reason, improper voltage or >> excessive ripple current on the 5V line will prevent the CPU from >> working. Can also play merry h..l with the logic board itself, >> leading to failure to initiate video, read drives, etc. >> >> The fans will run fine at 10V or 14V, the processor will NOT run way >> outside the specs. >> >> Peter >> >> >> On Jan 1, 2012, at 4:24 PM, Allan Streib wrote: >> >>> Peter Frederick <psf...@earthlink.net> writes: >>> >>>> Check the fan in the power supply. However, once they go sprong, >>>> usually the 5V line in the PS is flaky and it won't boot because the >>>> processor voltage is too low. >>> >>> Power supply fan is working. All the fans come on at full speed as >>> soon >>> as it's plugged in. >>> >>> Allan >>> >>> -- >>> 1983 300D >>> 1979 300SD >>> >>> _______________________________________ >>> http://www.okiebenz.com >>> For new and used parts go to www.okiebenz.com >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> >> _______________________________________ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> -- 1983 300D 1979 300SD _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
