[Samsung Galaxy Nexus] blazza:
HI, n00b alert for starters:)

So went on a longer trip the other day, needed to use GPS on my rooted GNEX running AOKP 4.2.2 (its been a month plus now, but as far as I can remember, last kernel was Faux), when the device started to reboot randomly, sometimes straight from the GOOGLE logo, sometimes from within the OS, the longest it kept running being 10-20 mins. The display had sometimes a purplish hue when the system crashed, rebooted to GOOGLE logo w/ unlock icon, and booted normally. Since I thought it could be a hardware issue (remember reading GNEXs had problem with processors comming off the mainboard?), I wanted to have things back to normal/original before claiming warranty (haha, try to claim one with a broken glass), and for other reason to rule out possible FW/SW errors. Now this is where it gets tricky, since some time allredy passed: I updated via adb/GNEX TOOLKIT to the stock image of 4.3. Phone got stuck at GOOGLE logo, I was able to to get to fastboot, which I on one occasion somehow mistook for the fastboot mode, then I came across the idea of using ODIN without previous experience, and thats where things have gotten really bummed. I suppose I might have flashed wrong version, since the only thing that came up since then, is the "phone" /!\ "PC" screen. Since there was no way of getting into adb, fastboot, I decided to take a try and bring it to the dealership where a nice lady took the piece to the back room and came back with a suggestion of (equivalent of) USD 15 for repair. What a price for geting rid of such pain... When I came to pick it up, a sorry face greeting me said it all... No cigar... Never been told what they actually did, never really asked, since the symptoms were still the same. Then I let it sit for couple more weeks, then decided to have a second chance with it, since the screen comming up and at least some sort of acknowledgement by PC still gave some hope. I tried couple of ODIN methods found here as well as elsewhere, like CF-Root-GGN_YAKJU_ICL53F-v5.1, with no luck, the progress bar on display got either stuck after first 1/8", or went all the way through, but after time for settling, still just the triangle screen. Then I went to a H/W store, built a jig with MicroUSB A+301k (1% tol), which still brought me only to the yellow triangle. Then last night I started fondling around with OMAPflash: Downloaded the tuna zip file, pulled battery, started the batch, and voila all smoth, no errors, then I let the phone sit for some time only to boot to the triangle again! Tried this a couple of times more, same result. All the time, ODIN and OMAPflash, I used only 2 of my laptops USB ports. Then, for some reason, I used a port I hadnt used before, and voila, ODIN shows PASS! in 2:02 - 2:03 mins, but the thing still boots only to trisngle again! Between these tries, I randomly used the jig again to try if anything has changed, but still cant get to Download/fastboot. All this time, when I connect to pc, I keep getting various devices, mostly Samsung USB modem, with battery out and plugged in cable, the OMAP4440 device pops up intermittently to vanish after 2 secs (normal behavior as I read, OMAPflash still says its capable of downloading, gets its chore done, but then lets me sit there with the triangle again. Im slowly running out of Ideas (OK, Im tottaly out of ideas:) on what to do next, I came across a posting where a guy is suggested to have the JTAG done by, but it seems to me that the symptoms arent that bad to have it JTAGed. Yet. What would you suggest to do-try?

ODIN result after flashing CF-Root-GGN_YAKJU_ICL53F-v5.1.tar:

<ID:0/004> Added!!

<ID:0/004> Odin v.3 engine (ID:4)..

<ID:0/004> File analysis..

<ID:0/004> SetupConnection..

<ID:0/004> Initialzation..

<ID:0/004> Get PIT for mapping..

<ID:0/004> Firmware update start..

<ID:0/004> boot.img

<ID:0/004> NAND Write Start!!

<ID:0/004> Transmission Complete..

<ID:0/004> Now Writing.. Please wait about 2 minutes

<ID:0/004> Receive Response from boot-loader

<ID:0/004> RQT_CLOSE !!

<ID:0/004> RES OK !!

<ID:0/004> Remain Port .... 0

<OSM> All threads completed. (succeed 1 / failed 0)

<ID:0/004> Added!!

Thanks for your energy spent on reading/answering this LONG post, any help greatly appreciated. PS: As a thank you, I am willing to spend couple bucks on charity of your choice (fund your beer yourself, there are bigger issues in this world:) / excuse possible typos, my keyboard sucks big time:D / and greetings from the Czech Republic!