O n most dell laptops right at the base of the screen is a panel that pops off. If so there is a small card about 1-2inches wide ans 3-4 inches long. It is above the keyboard. this is an aux. power board and should have a connection on it to help power the screen. If this model dosent have this poard than the built in screen cooler is bad and you will have to replace the whole screen.
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There is a verity of things you can check & or replace. You mentioned the CPU fan is not turning. This is very very important.
This suggests possible CPU fan is defective. Average life span for a CPU fan is 5 years or 50,000 hours. Your MB uses Intel PGA socket 478. For a replacement heatsink & fan assembly open the link provided; http://www.amazon.com/Thermaltake-A4012-Cooler-Intel-Socket/dp/B000FEW8JW/ref=dp_cp_ob_e_title_0 A new heatsink assembly will come with a new fan attached to the heatsink. It should also come with new thermal past or thermal tape attached to the bottom of the heatsink assembly. As to the front panel LED light blinking continuously. If the LED light is red in color this means your primary hard disk drive is trying to load windows. My suggestion is for you to replace the CPU heatsink assembly first. No need to remove the CPU from its socket at this time. If you never replaced the Heatsink & fan assembly watch the video included below; http://www.youtube.com/watch?v=4OB1hxxKdec Once completed your system should function correctly. If it doesn't, post you’re finding here & I'll help you further. Cheers' Mike
If you are having trouble booting the system and getting a screen
try the following multi-step procedure. Power off your system first
before completing any of the following tips.
1) Check CMOS clear jumper JP1 (JBAT1 on some systems). Set for CLEAR for 5 seconds, then move back.
2) Check CPU host clock jumpers (if any) are properly set. Note: does not control memory bus.
3) Check your power supply. Should be 110/115v for North America.
4) Unplug all data cables for IDE and FDD from the motherboard.
5) Unplug all power supply cables attaching to your IDE and FDD drives.
6) Remove all cards and devices EXCEPT for video, RAM, CPU, CPU heatsink/FAN.
7) Move memory into a different bank, if available.
8)Unplug the CPU and reattach.
9) Ensure your CPU heatsink/FAN is attached properly to the CPU.
10) If you use a variable RPM fan ensure its set for full speed.
12) If 1-11 do not help power off and test the motherboard outside
the computer case to eliminate a case/motherboard power short.
13) Retest. If the board now works check for case problems. If the system still is not working continue…
14) You may have a possible hardware problem. Any device in the system
may be a possible culprit. Use process of elimination to determine the
cause. Swap out as many components as possible starting with RAM, CPU,
POWER SUPPLY, VIDEO CARD (if present) and/or MOTHERBOARD.
If that problem is happen check the monitor cable if it is correctly plug to the motherboard, if your motherboard have video card attach try to remove the video card, if the same things happen thee problem is the processor, you need to check the processor, remove it and clean then put a thermal paste so that the heat from processor will absorb by the heatsink, and be sure that the heatsink fan it working to prevent the heat.
Sounds like improper contact with the cpu and heatsink. If the fan runs...it runs and it'll do it's job but if the contact isn't proper, it'll overheat. These are older machines and the thermal paste that Dell uses turns to power after hundreds of power cycles. Buy some cheap silicon based thermal paste, clean off the cpu and heatsink with some 90% ir greater iso alcohol and apply a small rice grain sized drop of paste on the cpu. When you install the heatsink, give it a couple of twisted to spread the paste out.
Hi, have you tried removing the CPU and using a Air Jet Spray can to clean all contact pins and pin holes?
The problem sounds like a loose chip. So also check all on board chips are seated, including RAM chips. Air spray can be bought from most Computer stores.
Have you removed all memory, other cards and unhooked all other drives to see if a short exists there? With a 300W PS some other component may be pulling too much that the CPU can't start so it tells you the problem is with the CPU or The CPU its refering to is on the video card?