Blue light but black screen

GetHuman-breerrus's customer service issue with Sprint from August 2018

Help with my Sprint issue
Tip from another customer
If you are having technical issues with your Sprint device then I suggest bringing the device into a store near you. You can use this locator to find the store - http://storelocator.sprint.com/locator/
The issue in GetHuman-breerrus's own words
I have a Galaxy S*. Usually it works fine. I plugged it in before I went to bed, and this morning it won't wake up. The blue message light is blinking, but the screen stays black no matter what I do.
Tell me if I can do something that will fix this, or if I have to take it in to a store.
I've pushed every button, and even tried restarting by touching where the Restart icons usually are on my screen. Didn't restart.
I have an issue with Sprint too
How GetHuman-breerrus fixed the problem
A guy at the store "rebooted" my phone by pressing the down volume button and power button at the same time.
Please help with my Sprint issue
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Sprint

Customer service issue
Reported by GetHuman-breerrus
Aug 24th, 2018 - 4 mons ago
I have an issue with Sprint too
Fixed
GetHuman-breerrus shared how to fix
Seen by 5 customers so far
Similar issue to 2291 others
0 customers following this
Items needed
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Name
IMEI number
Timeline
GetHuman-breerrus started working on this issue
Aug 24th 12:53pm
GetHuman-breerrus shared this issue with friends on Facebook
Aug 24th 12:53pm
GetHuman-breerrus indicated the issue is not fixed yet.
Aug 24th 2:22pm
GetHuman-breerrus indicated the issue is not fixed yet.
Aug 24th 2:26pm
GetHuman-breerrus confirmed the issue is fixed. Hooray!
Aug 25th 10:49pm