1
vote
1answer
60 views

Can Current Backflow from Powered Hub's Adapter & cause PC Damage?

Getting this short: Can current flow from a powered USB hub's power adapter (lying 10 Meter away) back to computer via usb port and cause damage to Computer components like mobo, etc? What should be ...
0
votes
1answer
30 views

Are Samsung Series 9 ultrabooks (purchased in the US) compatible with 240V/50Hz power input?

I'm traveling and I'm curious if I can use an adapter. I have a replacement power chord and it states that it can take in 100V-240V, 50-60Hz, but I want to make sure that the ultrabook itself accepts ...
1
vote
0answers
71 views

When unplugged, the UPS plug gives out current. Is it bad? [closed]

We have several power issues in our house like : Occasionally loosing bulbs (in two holders, the light bulbs went out two times. If we put a new one, it will go out after several days. One went out ...
0
votes
0answers
17 views

1.1 Volts instead of 3.3 Volts. Weird RAM behaviour

One of the employees today gave me a problematic computer. It was randomly freezing. I thought that was a RAM problem and opened the case. The red LED is ON near the RAM. Tried swapping to same type ...
1
vote
2answers
1k views

Power supply bad with good voltage?

I am trying to drive out the reason I am having some hard drive "hard resetting link" error problems on a Linux Debian box. I am trying to eliminate the power supply as a problem in trouble shooting, ...
1
vote
1answer
321 views

Insufficient power from an adapter

Would not having enough power (or voltage or amperage) from an adapter make a laptop no longer charge/boot up (if the battery is out of power)? What about causing shorts? And would using a different ...
1
vote
0answers
204 views

1.8 VDC POWER remains on USB after SHUTDOWN (HP Compaq Pro 4300 SFF - Product ID: QZ219AV)

I am having unexpected opportunities with a USB Device failing to properly initialize on startup after a shutdown, which seems to be caused by residual power remaining on my USB Ports (after ...
1
vote
1answer
217 views

UPS switches to battery power when plugging in devices?

Over the past week or so I've had my UPS switch over to battery power briefly when plugging in new devices (possibly limited to just AC -> DC chargers, but haven't tested anything else). I had ...
3
votes
1answer
2k views

Is it safe to use a laptop AC adapter with 220V power if the AC cable is not rated for 220V?

The AC adapter supplied with my laptop is designed to accept voltage in the range of 100-240VAC at 50-60Hz, but the AC cable that plugs into the adapter unit itself is only rated to 125VAC 7.5A 2.5A. ...
3
votes
2answers
398 views

CPUs: more transistors, less voltage?

I have read in an article that newer CPU cores have narrower circuit tracks so more transistors can fit in the core. The author wrote that since there are more transistors, the voltage is reduced. ...
2
votes
1answer
190 views

Does the power consumption for non-scaling processor vary from idle to busy?

Even though newer processors come with scaling (SpeedStep, Cool'n'Quiet), some computers have motherboards with outdated bios which do not support the feature. Thus, they run at full clock speed. Even ...
3
votes
1answer
5k views

PC power supply & normal range for voltages reported in BIOS hardware monitor?

I'm trying to diagnose whether my computer has an ample power supply. Sometimes when I play a video-intensive game, both monitors lose the video signal, even though the computer remains on and sound ...