UPDATE: Sony has issues the following statement regarding reports of early PS4 failures to IGN:
"A handful of people have reported issues with their PlayStation 4 systems. This is within our expectations for a new product introduction, and the vast majority of PS4 feedback has been overwhelmingly positive. We are closely monitoring for additional reports, but we think these are isolated incidents and are on track for a great launch.
There have been several problems reported, which leads us to believe there isn't a singular problem that could impact a broader percentage of systems. The number of affected systems represents less than .04 per cent of shipped units to date, which is within our expectations for a new product introduction."
ORIGINAL STORY: Sony is investigating reports of defective PlayStation 4 units in the US.
Users on Reddit and a couple of journalists at US websites have discovered problems with their PS4.
The cause of the problems is unknown, although some believe faulty USB connections may be to blame.
Now, Sony Worldwide Studios boss Shuhei Yoshida has taken to Twitter in an attempt to calm growing concern.
"Be assured we are investigating reported PS4 issues," he said. "The number is very small compared to shipped, we believe they are isolated incidents."
Reddit user "aragon", who won a PS4 via a Taco Bell promotion, is one of those affected.
"When I turn on my console it just sits there pulsing blue," he said.
"As far as I can tell it is supposed to turn white but it isn't doing that. There is no signal on my tv either. I talked to at least 5 tech support people on the phone and 1 on-line. All of them but two outright refused to help me saying that the console is not yet released and they can't help me. Two of the tech tried to help me boot it up into safe mode and that failed. At that point they both told me to call back Friday."
Eurogamer is seeking further comment from Sony. The console launches in the UK on 29th November.