I have a Maganavox LCD TV that is about 2 years old. When we hit the power button, the green power light keeps flashing on and off, but will not turn on. There is an occasional dim flash of light like it wants to turn on, but it won't. When it first started doing this a few weeks ago, it would eventually turn on after a few minutes of this flashing. Now it will flash on and off for 5 minutes and then just stop flashing. When I hit the power again, the same thing happens for about 5 minutes but it won't come on. Any ideas? Thanks.