I am a noob and I bricked my HTC Sensation 4G. (Admitting you have a problem is the first step.) 
This was after the official OTA ICS update; rooted with S-ON, unlocked HBOOT 1.27. It was one of two things: 1) I was very lazy and used 1X to unlock Hboot, then subsequently flashed the HTC One X kernel without realizing it; 2) I inappropriately used writesecureflag 3.
Either way, I was stuck in a bootloop (white screen with green HTC) for the last week. I tried every solution I could find in in these forums to no avail, but I finally fixed it myself. If someone already posted these steps, sorry I wasn't trying to steal your thunder. I saw many others are having this problem, so I’m sharing my solution as a noob to noob how-to:
I did this on Windows 7, 64 bit to a T-mobile 4G model which was rooted with HTC Dev unlocked Hboot 1.27, S-ON, and CWM. It should work on other models, but I don’t know about other Hboots.
Update your SDK tools and drivers (excellent guide here) and download the stock RUU appropriate to your model (excellent guide here)
Remove your SIM card and insert an empty, formatted sd card into your phone
Put your phone in fastboot (easiest way is hold the ‘down’ volume button and power button on your Sensation at the same time, then select fastboot with the volume buttons and press power) and connect your device to a USB 2 port with a reliable USB cable. You should now see the words “fastboot usb”
Navigate to the folder containing adb and fastboot, press Shift and right click your mouse; select “open command window here”. At the prompt type “fastboot oem lock” (without quotation marks) and press enter. Your device should now say something like “Relocked” at the top and may say “Security Warning”. Don’t touch it.
Run the RUU executable that you downloaded earlier. It should take about 5-10 minutes and will then say that your device is ready for use, just wait for it to reboot on its own.
You should now be the proud owner of a shiny new LOCKED, UN-rooted device all ready to be screwed with again.:good:
This was after the official OTA ICS update; rooted with S-ON, unlocked HBOOT 1.27. It was one of two things: 1) I was very lazy and used 1X to unlock Hboot, then subsequently flashed the HTC One X kernel without realizing it; 2) I inappropriately used writesecureflag 3.
Either way, I was stuck in a bootloop (white screen with green HTC) for the last week. I tried every solution I could find in in these forums to no avail, but I finally fixed it myself. If someone already posted these steps, sorry I wasn't trying to steal your thunder. I saw many others are having this problem, so I’m sharing my solution as a noob to noob how-to:
I did this on Windows 7, 64 bit to a T-mobile 4G model which was rooted with HTC Dev unlocked Hboot 1.27, S-ON, and CWM. It should work on other models, but I don’t know about other Hboots.
Update your SDK tools and drivers (excellent guide here) and download the stock RUU appropriate to your model (excellent guide here)
Remove your SIM card and insert an empty, formatted sd card into your phone
Put your phone in fastboot (easiest way is hold the ‘down’ volume button and power button on your Sensation at the same time, then select fastboot with the volume buttons and press power) and connect your device to a USB 2 port with a reliable USB cable. You should now see the words “fastboot usb”
Navigate to the folder containing adb and fastboot, press Shift and right click your mouse; select “open command window here”. At the prompt type “fastboot oem lock” (without quotation marks) and press enter. Your device should now say something like “Relocked” at the top and may say “Security Warning”. Don’t touch it.
Run the RUU executable that you downloaded earlier. It should take about 5-10 minutes and will then say that your device is ready for use, just wait for it to reboot on its own.
You should now be the proud owner of a shiny new LOCKED, UN-rooted device all ready to be screwed with again.:good:
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