Monitor going to sleep when using a USB drive

This problem is so random that I would guess the PSU is failing. That is usually the catch all for completely random stuff, especially when it is behavior that has changed over time.

**UPDATE** I shut my computer off for a while, between my last post and now, and it the problem has stopped. IT still bugs me though, and I'd like to find the root cause.

Same thing as I already told you, most likely.

The PSU is the #1 source of random problems, especially the ones that are intermittent.

**Update**

The usb drive's haven't caused my computer to go to sleep since that first incident, however, I've been keeping my pc off most of the time an only have it on when my girlfriend has to do her homework. Since starting this trend I havent had many problems, but one day after she'd been on it for a little bit i started going to sleep and acing like it was rstarting. I'm not sure if it actually did restart or not because I was not in the room, and neither was she for that matter, but she was in the next room over and she said she heard all of the fans and such kick on like usual when starting up and then when she went back into the room it was on the desktop. Do you (or anyone else) still think it is the power source? That seems to be the answer i'm finding the most but I'd like to be as sure as I can be before I get a new PSU this week.

Does anyone else agree that it could be the PSU?

It's possible, for the power supply to cause the problem. On a side note, this is the first time I've heard something like this...

Yeah it seems to be an uncommon problem. I've looked around various sights and such and I haven't been able to find another person who has experienced this. I'm fine with getting a new psu, but i'd like to be as sure as possible, money is tight.

The only other thing that it sounds like it could really be is just a bad monitor.

The only way to test is to either borrow a different PSU or borrow a different monitor.

I didn't think of that. I don't think it's the monitor because I think the computer has restarted before, but it's still worth a check. If there is anything new to post after trying it i'll post on here. If not i'll wait to post until after i get a new psu this weekend.

I am having the same problem. If I remove a usb device while working on the computer the monitor goes to sleep. Never seen this before. I have a 27" asus monitor and a seasonic 650w psu. Let me know if your new psu makes a difference. I have trouble replicating the problem because it only happens sometimes. I tested the psu and all the voltages are within the norm. So weird....

I have been having the same problem but I have three screens and all of them go out. I know it's not the screen but I would be pissed if it's the PSU because It cost me a bundle. I'm going to put up with it for now but please let me know if a new PSU fixes it for you.

My has been doing the same thing. usb anything on or off screen goes dark and starts auto looking for signal until I move mouse or keyboard. I have 2yo tx750 psu...I think it started happening after charging a referbishied ipad1 the battery was really dead it would not charge from its charger. I thought the charger was bad so i tried the computer and heard a surge a few days later this starts. I was hoping it was the video card wanting excuse to upgrade.

I swapped out the PSU and it fixed the problem.