mobile

I've tried posting this problem in the specific device location - but I'm not getting any bites really, re: what the phones problem might be - over 600 views, with only one comment - so I think I've gone through the proper channel to get this fixed.

Here's the thing.
I inherited a problematic HTC One X.
When I received it, it had a boot loop - it would load up to the Sense 5 (I think) desktop (skyscraper type wallpaper) and then it would hang - then restart. Eventually it would just hang on the HTC splash screen.

When I found that it had too high a version of HBOOT (1.72), ie too high to try flashing an RUU - I opted to install Cyanogenmod.

Initially I tried installing CM11 - but it wouldn't install - I kept getting MD5 errors, or Status 7 errors - wiping caches, formatting drives and so on - always flashing boot.img before booting. Nothing would work.

I tried CM10, and this seemed to install fine.
However - every time the phone would go through the boot up, and get to CM10 welcome screen - and at that point it would hang.
Occasionally - it would hang with weird horizontal lines through the page graphics - sometimes it would crash like this - but also with a sort of high pitched white noise continuously coming out of the speakers.

If I repeatedly try to boot through this system, the time at which the phone would hang would get shorter - it wouldn't get to the CM10 welcome screen - eventually hanging again on the HTC splash screen. But now it sometimes actually boots to Recovery (I've installed the most recent version of Philz recovery which seems to work - IE touch and charging works ok).

So - question is, what does this sound like? - What do you think could be the issue here?
Does this sound like a hardware problem rather than software - and if so what?
Anyone else on here experienced anything similar?

PS - I haven't tried to open the phone case for a look inside - it may have experienced water damage or something - but I don't know at this stage...