|
Dell Optiplex 755 powers up by itself
|
|
|
LDee
Senior Member
|
16. June 2010 @ 22:07 |
Link to this message
|
|
New machine powers up for a couple of seconds by itself every now and then, fans spin, lights on, then it turns off again. Some of the intervals seem regular and at other times it does it a couple of times within 20 seconds or so, otherwise about once every 20 minutes.
Apart from this it works fine. Wake on lan is not activated.
Thanks.
|
|
Advertisement
|
|
|
|
|
ddp
Moderator
|
16. June 2010 @ 22:13 |
Link to this message
|
|
disable the power management in the bios to see what happens.
|
|
snazzy619
Newbie
|
17. June 2010 @ 15:29 |
Link to this message
|
Originally posted by ddp:
disable the power management in the bios to see what happens.
and check your ram or even better buy new ram i had the same problem had a gig and 512 mb, pc restarted by itself then i removed the 512mb and its perfect
|
|
LDee
Senior Member
|
17. June 2010 @ 18:21 |
Link to this message
|
All power options are disabled in bios. Updated bios, reset to factory.
Ram seems fine, I've tried all combo's and it's still happening.
Weird one, I've had similar things happen with dodgy kettle leads and extension plugs but I've ruled all that out his time, no idea.
|
AfterDawn Addict
1 product review
|
18. June 2010 @ 05:26 |
Link to this message
|
Originally posted by snazzy619:
Originally posted by ddp:
disable the power management in the bios to see what happens.
and check your ram or even better buy new ram i had the same problem had a gig and 512 mb, pc restarted by itself then i removed the 512mb and its perfect
The problem is not with random reboots...the problem is that the system turns itself on, then back off. I have to say this is a weird glitch...especially without power management, or WOL, and with the power and reset switches ruled out (I assume the system does the same thing with them unplugged).
The issue almost has to be either the mainboard, the PSU, or the settings in bios. I know you have turned of power management and WOL, but sometimes bios options are glitched so that "off" is really on, and vice-versa. Other than that, the only way I can think of this happening is if there was a intermittent short of some kind in the mainboard or PSU...more likely in the PSU.
|
Moderator
|
19. June 2010 @ 05:41 |
Link to this message
|
|
I had an old Compaq machine do this, very spooky. The machine eventually got sent to the great motherboard grave in the sky, there was obviously a motherboard problem of some sort causing the machine to randomly switch on and enter our mortal coil. I had swapped out the PSU and it still did it hence why i blamed the motherboard
Main PC ~ Intel C2Q Q6600 (G0 Stepping)/Gigabyte GA-EP45-DS3/2GB Crucial Ballistix PC2-8500/Zalman CNPS9700/Antec 900/Corsair HX 620W
Network ~ DD-WRT ~ 2node WDS-WPA2/AES ~ Buffalo WHR-G54S. 3node WPA2/AES ~ WRT54GS v6 (inc. WEP BSSID), WRT54G v2, WRT54G2 v1. *** Forum Rules *** |
|
LDee
Senior Member
|
19. June 2010 @ 17:56 |
Link to this message
|
Since last posting I changed the ram (inital config was 512mb x2 and 1GB x1) to a single stick of 2GB. I updated the bios to the newest version, I've gone back to the version before that, took the system battery and power lead out for a while, disconnected the main power from psu to mainboard, tried it with 3 different cr2032 batteries (one brand new), the bloody thing is still happening...
I suppose next week I'll have to go through trying it with another psu and mainboard.
|
|
LDee
Senior Member
|
25. June 2010 @ 07:03 |
Link to this message
|
I've swapped that box for a whole new box, it's still happening on this one as well! I've tried 3 different bios' in case the bios settings had been programmed wrong. I'm thinking now it's some kind of feature, don't know, will probably phone Dell at some point but since it's out of warranty don't know how much they'll tell me.
The user will have to live with it for now, minor problem anyway.
|
Senior Member
|
25. June 2010 @ 13:28 |
Link to this message
|
|
check the power on button and the power on wire could just be a short that turns it on and then of course turns it off, interesting problem also check a loose screw isn't wedged agianst the on / off pins
i7 3770 12GB ram terrabyte sata drive 1 750Gb sata drive 285GTX graphics Sony dvdwriter same NZXT Nemesis case
Still playing Black Hawk Down why did I upgrade?
This message has been edited since posting. Last time this message was edited on 25. June 2010 @ 13:31
|
|
LDee
Senior Member
|
25. June 2010 @ 17:22 |
Link to this message
|
|
No, what I mean is, I've swapped the whole machine for another different optiplex 755 and it's happening on the new one as well, that's why I suspect it's some sort of feature or something similar.
|
|
ddp
Moderator
|
25. June 2010 @ 23:00 |
Link to this message
|
|
on the same wall plug or power bar?
|
AfterDawn Addict
1 product review
|
26. June 2010 @ 00:01 |
Link to this message
|
|
Just a crazy thought here...is there a power key on the keyboard?
|
|
LDee
Senior Member
|
28. June 2010 @ 05:04 |
Link to this message
|
|
|
|
Advertisement
|
|
|
|
LDee
Senior Member
|
29. June 2010 @ 04:50 |
Link to this message
|
|
That fixed it, went into the mbex bios by pressing ctrl+p and disabled it and it stopped!
Wish I had googled this more thoroughly before carting the thing around and swapping it for another. Must remember for future that there are sometimes more than one bios.
|
