|Most more recent laptop will not boot at all, or will not fully boot, if they are connected only to the AC adapter - the main battery must be installed, and it must be capable of being charged up at least a minimal amount. |
How old is the main battery ?
There may be nothing wrong except you're getting no video on the built in display - that's common after a laptop has been used a lot..
Laptop hard drives make very little noise. If the hard disk activity led lights up and blinks while booting, there's probably nothing wrong with the hard drive or the ram. (If the user has to logon to Windows, it will stop blinking shortly after it gets to that point.)
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1:
DO NOT plug in or unplug a monitor's video cable into / from a video port while the computer is running. Doing so can damage the monitor's circuits and/or the video adapter's circuits.
Some laptops will display on an external monitor without you having to do anything.
If you get no video on an external monitor, some laptops have a key combo that you must press to toggle the display to external video only / sometimes both / built in display video only - see the Owner's or User's manual for the model.
Similar may apply to HDMI output - you may need to press some key combo to toggle it on.
"I was told the RAM had been replaced after burning out previously"
What event happened just before he or she assumed the ram had "burnt out" ?.
Ram that was working fine previously doesn't "burn out" unless some damaging event happened to the ram or to the computer, and even if it did, it's extremely unlikely more than one module would go "bad" at the same time.
"damaging event" = e.g.
- someone plugged in or unplugged the ram without removing both the AC adapter's connection and the main battery first
- the laptop was exposed to a power surge or spike when it was plugged into the AC adapter
- someone dropped the laptop, or spilled liquid on it. It doesn't matter whether it was running at the time, it could still have been damaged, if the main battery was installed at the time - ATX mboards are always powered in some places. In that case, something else other than the ram is likely to be damaged.
- if any ram module was plugged in backwards (it won't go all the way into the slot but still connects to the contacts quite well) and someone then attempted to boot the computer, both the backwards ram module and the ram slots circuits of the slot it is in are fried instantly, and neither can ever be used again. That may also damage the mboard otherwise. If you see any evidence of damaged contacts, black carbon deposits when you use a magnifier to examine the ram slot, someone did that. If you clean up any bridged contacts, carbon deposits, the mboard MAY work with ram in the good slot.
"RAM was tested in a different laptop and was fully functional."
Ram working in a different computer shows there's nothing wrong with it, but that doesn't necessarily indicate it will work in the subject persons particular model.
It has to be compatible with his particular model.
Has this replacement ram EVER worked in the subject computer ?
It is easy to test for incompatible ram that has caused your mboard to fail to boot.
Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
If you don't get any beeps, something else is wrong.