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When you plug in the power cord is there any lightswhatsoever on the laptop, where the plug goes in or on the AC Adapter of thepower cord?
When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the laptop is trying to boot or may have booted, butthe screen is not showing for some reason.
Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.
Maybe your power cord is bad if you don't get anything to happen whatsoeverwhen you press the power button. And if that's true maybe you wasoperating off the battery the last time you had it on and since the power cordis bad, it was not charging the battery so the battery is drained and the powercord is bad.
Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove theBattery, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in (leave the batteryout) and hit the power button to see if it boots. If it does, you can putthe battery back in and let it charge.
Very possible that something has short circuited on the motherboard. I would also try re-seating the memory located on the bottom of the laptop(which could be loose explaining the intermittent nature of the issue). On an IBM I once fixed that had the same issue I took out the CMOS battery and battery for one week and then re-installed and that fixed the issue. But good luck to you!
Sounds like a classic case of hardware failure!!!!!!! possibly your motherboard, start by removing the battery, hard drive and optical drive. disconnect the laptop monitor and connect the laptop to an external monitor. remove the memory modules clean the brass contacts with a eraser and place back in the machine 1 at a time to check to see if they work, remember to plug in the AC power suppy, if you see the post screen then its a memory issue and you can then reconnect your laptop monitor to see if it lights up, if everything works but the monitor then its the inverter or backlight that has blown and is easily repairable saving you money on a brand new screen
try sensing if your cpu fan is working, it is under the power switch side, you can see small exhaust slots, put your hand beside it and feel if some air is coming out when you turn on your pc.
When you turn you pc on and only orange light blinks, it means that no power was getting into it, it blinks because no electrical power is coming from your power adapter and the battery is drained. Check your power adapter cable, this is the very cause why your pc is shutting down. usually the wire from the adapter to the pc is faulty.
I am facing a similar problem with 5160 and my power button will not power up the laptop. I presses the shift key, it got powered up (offcourse only fan started but the screen is black)
Try pressing shift key to power up.