Also “Try with no cables connected except the USB power lead, and SD
card inserted. You should see flashing of the OK light for ~20 seconds.
If that helps, plug in cables one at a time to identify which is
interfering with boot.” sounds useful.
What do you mean by OK light?
EDIT: Oh. It is GREEN LED
Yeah, it’s taken from the wiki.
Sequence 1:
Plugged WiFi adapter - hotspot started
Plugged HDStar - first power supply, then usb. got the tuner lock
WiFi hotspot not gets disabled
Sequence 1:
Plugged WiFi adapter - hotspot started
Plugged HDStar - first power supply, then usb. got the tuner lock
WiFi hotspot gets disabled
Sequence 2:
Plugged WiFi adapter - hotspot started
Plugged HDStar - first power supply, then usb. got the tuner lock
Sequence 3:
Plugged HDStar - first power supply, then usb. got the tuner lock
Plugged WiFi adapter - hotspot started
It is very difficult to identify a pattern. The system shows random behavior with each component attached.
What about booting with WiFi plugged-in?
every time it boots without any interruption. I can confirm it 100%
Again from the R-Pi Troubleshooting - eLinux.org
Keyboard / Mouse interferes with USB WiFi device
Connecting a keyboard and/or mouse while a USB WiFi device is connected, may cause one or both devices to malfunction. On April 30 2012, there was a bugfix[11] relating to USB sharing between high-speed (eg. WiFi) and full/low-speed devices (eg. keyboard/mouse). User spennig[12][13] reports this patch did not fix the Mouse/WiFi conflict. On 2012-05-12, user spennig was pleased to confirm that wifi was working with a USB keyboard and mouse, as long as the Raspberry Pi had a good PSU and a powered hub. Even so, some experimentation was needed, e.g. USB WiFi connected to the device, and the keyboard and mouse connected to the powered hub. Some experimentation may be necessary to find a working combination; however a good power supply is essential.
Seems this is similar with the WiFi adapter / HDStar tuner problem.
Intereting, I’m normally using the Tenda dongle and that hasn’t caused any problems thus far, but on Pi1 B+, I did have a case where PCTV would behave similarly even without any other USB devices.
EDIT: Actualy, it was model B, not B+. Anyway, same USB hub.
1 Like
Are you using a powered usb hub with Pi?
No. I have all my devices plugged in directly before boot.
Think this will help you 
https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=110457
Single-TT and Multi-TT USB hubs
http://www.cypress.com/knowledge-base-article/how-check-whether-usb-20-hub-multi-tt-or-single-tt-kba93279
This is a Multi-TT enabled USB HUB -Evaluation Board