Is that a tft you use? and if the red spot that you see is there at the same place everytime you boot your system, dont worry, its just a dead pixel. It happens with tft's and manufacturers say that upto 7 red spots need not be taken as a defect.
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I've seen this many times (red or pink lines) on an LCD screen when the video chip is over-heating... When is the last time you blew the dust out of the heatsink/fan area? Get some canned air and blow it out. Unless it's plugged really bad, the fan has died, or there has been permanent damage to the system, this should clear things up. Also, make sure you are using the laptop on a HARD surface, not actually on your lap, a pillow, couch, cloth covered table, etc. It needs airflow to keep it cool...
This indicates the LCD panel is dead if the red lines are going from top to bottom then its the lcd screen thats faulty it there is green/red line going from side to side then that means the motherboard is faulty, if you have just bought it from hp they will replace it if you bought it from a dealer or a second hand shop you will need to go back to the shop for a refund
it is most likely a burned polarizing filter. There is a polarizing filter on the blue light channel and another on the red channel. When black, or other dark colours are displayed, the red polarizing filter is supposed to block ALL of the red light being projecter. If the filter is burned, some light slips through and creates a red tinge on the projected image. If the red tinge only appears on dark images, but is absent when the images is completely white, a damaged filter is likely the problem.
Seems its hard to buy them. Best bet is probably buying a broken projector from ebay and stealing the filters out of it.
The color red and especially red colored lines or a pinkish hue are indicative of an impending screen failure. The only other possibility is that the data cable on the left backside of the lcd panel may be loose at the socket or on the motherboard. 9 times out of 10 though, it is the lcd panel that it failing.
Hardware failure in either the video chip or the lcd panel itself. To check which connect the laptop to an external monitor and see what appears: if the lines are still there then it's the chip - unreplaceable, the entire laptop is good for the skip; if the image is crystal clear then the panel must be replaced. If the laptop is still in warranty send it to them.
1) That red spot means that a pixel is stuck, actually it's very common on LCDs.
2 and 3) It usually occurs for a manufacturing issue.
4) The most of the time it doesn't mean that the whole screen is going to fail, but in my case I would take advantage of the warranty if the laptop is brand new and the warranty is still there.