Sometimes when I try to turn on my laptop (Vostro 3450), the screen will turn on but remain dark. No screen output will be visible. No beeps or other sounds either, the fan goes to what sounds like maximum speed.
When the problem occurs, I cannot turn off the system by pressing the power button, not even by keeping it pressed for more than 30 seconds. I have to disconnect all power sources (PSU and battery).
Some observations I've made so far:
- It seems to be related to how much time has passed between turning the laptop off and on again. I can reliably reproduce the problem by turning the laptop off and then turning it on again within one second. The more time passes, the higher the probability off a successful boot. So far I haven't encountered the problem when I turn the laptop on after leaving it off for an extended period of time, e.g. over night.
- When I disconnect all power sources (PSU and battery) and then connect at least one of them, the next system start will always be successful.
- The problem is OS independent. It can happen after selecting Windows 7's sleep mode, hibernation mode, hybrid sleep or regular shutdown, but it can also happen when I go to the BIOS and turn the system off by pressing the power button (in other words, when I did not even reach the OS).
- The problem is not RAM related. I have removed the RAM but the problem still occured (but the system beeped twice because of the missing RAM)
When it happens...
- The Dell logo does not show up, nor does the prompt for the BIOS password I'm using. The system does not seem to reach that stage.
- out of the four backlit symbols on the front of the laptop (Power, HDD, battery, WiFi) only Power and WiFi will be lit
- I've got a backlit keyboard, but the lights will not turn on. This is usually the first sign that the system is not going to boot up, because at the beginning of a successful boot up process the keyboard lights will turn on almost immediately after pressing the power button.
- As I wrote, when the problem occurs I have to cut the power supply in order to turn the laptop off. The next time, I can start the system normally. Now, if the previous way of turning the laptop off was through Windows' non-hybrid sleep option, on the next correct boot up I will be presented with the "Windows did not shut down successfully" message.
Any ideas/suggestions?