Computer automatically waking up from sleep when fluorescent lamp turned on

Elite007 · Nov 4, 2014

Hi,
I hope that I am posting this in the right category (Systems).
I am noticing a very odd behavior from my desktop PC (Dell Optiplex 745) from two days i.e whenever I put it in sleep mode (Windows 7) for sometime when I am away and then when I come back and turn on the fluorescent lamp in the same room my PC automatically wakes up. The only change I made 2 days back was unchecking the option to "allow this device to wake my PC" for both the mouse and the network adapter, since then I am noticing this weird behavior.
And yes, there is a separate switch for the fluorescent lamp and the PC which is connected to the wall socket, they both have no connection whatsoever. Any help would be appreciated because I am totally clueless.
Thanks in advance

boosted1g · Nov 4, 2014

Put PC on surge protector and this problem will likley go away.

First of all you should have your PC on surge protector to begin with, why anyone lets expensive eletronics be plugged straight into outlet is not smart.

Florecent lights put off a dirty frequency tone over the wire and can cause different anomalies to occur. This is why many "smarthome" devices like x10 that uses powerlines has to use filters on florecent fixtures.

westom · Nov 6, 2014

boosted1g :

Numbers are clearly printed on each protector's box. A 120 volt protector ignores everything until voltage well exceed 330 volts. If a fluorescent lamp is created 500 volt surges, than the homeowner is replacing clocks, bathroom GFCIs, smoke detectors, CFL bulbs, radios, and recharging cell phones daily.

Spikes from a fluorescent lamp are, worst case, a few tens of volts. That is massive noise to smarthome devices (ie X-10) and Ethernet on AC wires. And a noise so tiny as to be converted into rock solid DC voltages consumed by a computer's semiconductors.

Not clearly stated. Is every power on device in the BIOS disabled? Checked or unchecked - does that mean enabled or disabled? List of devices usually includes keyboard, mouse, ethernet, and fax modem.

Dell power supply means noise is made irrelevant. But other devices (ie self powered USB devices) can compromise Dell's robust noise protection. Also key is integrity of household safety grounds to each relevant wall receptacle. A defective safety ground can permit noise to bypass robust power supply protection.

Elite007 · Nov 6, 2014

westom :

boosted1g :

Numbers are clearly printed on each protector's box. A 120 volt protector ignores everything until voltage well exceed 330 volts. If a fluorescent lamp is created 500 volt surges, than the homeowner is replacing clocks, bathroom GFCIs, smoke detectors, CFL bulbs, radios, and recharging cell phones daily.

Spikes from a fluorescent lamp are, worst case, a few tens of volts. That is massive noise to smarthome devices (ie X-10) and Ethernet on AC wires. And a noise so tiny as to be converted into rock solid DC voltages consumed by a computer's semiconductors.

Not clearly stated. Is every power on device in the BIOS disabled? Checked or unchecked - does that mean enabled or disabled? List of devices usually includes keyboard, mouse, ethernet, and fax modem.

Dell power supply means noise is made irrelevant. But other devices (ie self powered USB devices) can compromise Dell's robust noise protection. Also key is integrity of household safety grounds to each relevant wall receptacle. A defective safety ground can permit noise to bypass robust power supply protection.

Yes unchecking means disabling the option to wake the PC and that was in the windows not in the BIOS. BTW I don't have the OEM dell PSU anymore, I replaced it with an antec 500w PSU as I needed a 6-ping power connector for my graphic card.

Search

Computer automatically waking up from sleep when fluorescent lamp turned on

Elite007

Distinguished

boosted1g

Titan

westom

Distinguished

Elite007

Distinguished

TRENDING THREADS

Latest posts

Moderators online

Share this page