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There are a few reasons/causes of this. The most common cause is the modem going faulty. Remove the modem and it may come back to life as it can't finish POST. The Bios has an error, remove the Cmos battery and let the board discharge for 1/4 hour, re fit it and it may POST. The uProcessor may need re seating and have a bad contact on a pin. Re seat the uProcessor and clean off old heatsink compound installing new.
Maybe as they are the most common I have come across, you may fall into one of them, I hope, otherwise it is a dead motherboard I'm sorry to suggest. Even if the RAM is faulty, it should attempt to POST.
If a PC suddenly fails to boot properly, you should perform a hard reset
as the first action. Performing the hard reset will correct many
problems. If the computer still does not start properly, select your
symptom from the list below to guide you to the recommended corrective
all peripheral devices and remove all USB devices and SD media cards. You want to test the computer not the accessories!
the AC power adapter, remove the battery, and then press and hold the power button for at least 15 seconds
to drain all residual power and restore default startup settings.
the AC power adapter (but do not insert the battery), Press
the Power button, Look for
glowing LEDs near caps lock
and num lock
keys, and Listen for
sounds of a fan or other moving parts turning.
If the computer does not start, the LED
lights do not glow, and the display is black, you can perform one or
more of the following actions to resolve the no power issue.
Verify the computer is receiving power from the AC adapter
Verify that the AC adapter is not damaged
and is connected correctly to a working wall outlet plug. Verify AC
power is connected to the system board by examining the AC adapter,
wiring, and pin connection for damage. The keyboard LEDs will glow when
AC power is connected to the system board.
Damaged components, like the AC adapter or the pin in the power connector, may require an HP-certified repair.
Use a different AC power adapter
If you have access to a different AC
adapter or power pack that is designed for the computer, connect it to
the notebook and try to start the computer. If you own or have access to
more than one notebook, verify that you are using the adapter which
belongs to the notebook.
Using a power adapter that does not meet the power
requirements or has the wrong type of connector may damage the computer.
On newer notebook models, connecting the wrong adapter to the notebook
may cause the power LED lights to blink but not power the computer.
Remove the battery and boot on AC power only
A discharged or defective battery may
prevent the AC adapter from supplying enough power to start the
computer. To verify that power from the AC adapter is available for PC;
remove the battery, connect AC power adapter, and press power button. If
available, try using a different AC adapter, that is rated for the PC,
and repeat this test.
If LEDS do not glow and the fan or hard drive do not spin, AC adapter may need to be replaced.
If LEDs glow and PC boots, the battery may need to be replaced.
Remove the AC adapter and boot on battery power only
A defective AC adapter may not charge the
battery and prevent the computer from booting on battery power only. To
verify battery power available for the PC; connect AC power adapter,
allow battery to charge for 30 minutes or more, disconnect the power
adapter and press power button. If available, try using a fully charged
battery, of the same type, from another computer and repeat this test.
If LEDS do not glow and the fan or hard drive do not spin, battery may need to be replaced.
If tests of both the battery and the AC adapter fail, there may be a problem with system board requiring service by HP.
If LEDs glow and PC boots, the AC adapter may need to be replaced.
May be your computer motherboard wires connection get loose or getting moisture in wires. Or there may be some earthing problem in ur power switch. First, check the wires connection & tighten up properly. if problem persists, check the earthing by power tester. Check you RAM if it is properly tight in the jack.
If the power light is not on, it could only mean 3 things, power adapter, power outlet and the camera itself. First, try to connect it to a different power outlet, see if power light will come on, if not use a different power adapter with the same power specs, if still power light is not on, then it has camera could be bad. Call linksys support line and have it replace
connection to the motherboard as per your query is not critical. you can do trial and error method, since an LED connected in reverse will not damage it, but just show no glow. so just reverse again, if it glows then its okay if still no glow then the LED is dead. Anyway, if you need the manual you can download from this link: http://global.msi.com.tw/index.php?func=downloadfile&dno=3825&type=manual