I had same problem most of the time when evr i opened my ferrari 4000 to clean dust. try removing ram and putting back then power up..it always works for me but after few tries from one slot to another. also remove hdd and again attach.
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Re: No display jus beeps
Your memory chips must be had i that sounds like a chip problem under the laptop secured by two screws will be where the chip lodged pull it out and re-enter it might go it might not but that your problem I am sure of it.
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Remove main battery and try again, if nothing! check power adapter for correct voltage, If okay! sub out the ram memory one at a time and test, still no change! the DC jack is often the source of trouble and the laptop will need to be dismantled down to the motherboard level, the DC jack will probably need resoldering.
If you cannot "press DELETE to enter setup", then it's the motherboard, or the battery, or the AC power-supply that has the problem.
Since it's likely that at least one of the battery and the power-supply are working, it's probably the motherboard (or the CPU on the motherboard) that is failing.
Take the computer to a qualified technician.
Replacing the CPU is possible, and is not very expensive.
Replacing the motherboard is possible, but is very expensive
(a few hundred dollars for a replacement motherboard, plus $100 for the technician's time to disassemble/replace/reassemble).
The only "good" news is that your files on your disk-drive probably are intact, and can be read and transferred to a new computer.
Of course, you can try to sell the "dead" computer on eBay, so that somebody else can "frankenstein" your computer with their computer, to combine two dead computers into one working one.
I long + 3 short beeps or 3 short + 1 long beeps indicates memory problem.
The RAM module/s may need reseating to re-establish proper electrical contact.
If it still doesn't boot up then :-
Get the RAM module/s may be faulty, test the module/s in another laptop or get your friendly computer shop to test them.
I guess I can assume that you have it plugged into the ac power, so you know its not a power problem.
We also know its not a problem with the power switch since the light turns on.
So that leaves, motherboard, cpu, and ram possible problems. Ram would unlikely cause such a hault. Even with no ram, I believe the computer would make horrible beeping noises.
So if its a problem with the motherboard or cpu, its pretty much trash, unless you want to waste the money on ebay or some place for another cpu to try to swap.