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Older Dell laptop, pwr light on, fan running, that’s it, does not come on. Turn if off, the fan blows 2 seconds, then fan shuts off
Hi @kansas123 , What is the full model number of the laptop? Does it do this when the charger is connected? Sounds like the BIOS is corrupted and needs to be reset. Try the following: i). Disconnect the charger if connected. ii). Remove the main battery from the laptop. iii). Open the laptop and find the coin cell RTC battery on the motherboard and remove it from the motherboard. Note: remember the orientation of the coin cell battery before you remove it. Usually it is +ve on top as marked on the battery. Once it has been removed, measure the voltage of the coin cell battery. If it is <2.5V DC replace it. Normally it is a CR2032 (marked on battery itself) Lithium non rechargeable battery that is available most everywhere. As you didn’t supply the laptop model number, sometimes this battery may have leads on it and plugs into a socket on the motherboard rather than being held in a battery holder so just unplug it instead. iv). Press and hold the laptop’s Power On button for a full 15 seconds and then release it. v). Reinsert the RTC coin cell battery on the motherboard. vi). Re-assemble the laptop and reinsert the main battery. vii). Connect the charger and try turning the laptop on. If it starts there may be a message about the date and time being incorrect. This is normal as the BIOS has been reset. Once the time and date have been corrected the message won’t appear the next time the laptop is started. Also check if the battery is charging. If it is allow it to fully charge before disconnecting the charger.
Take a look at the RAM and see if that’s properly seated - Dell isn’t exactly good about proper RAM POST errors on the pre-3L (low power 1.3V) systems with cheap/mixed RAM, even today in some cases. The problem with your laptop is the E6420/30 is not known to have tight tolerances on RAM errors in some cases. Yes, the DDR3 1.5V Dells can take cheap RAM all day to the point you can buy unused generic Chinese RAM on eBay for nothing, but if it has an issue and there’s poor communication you get this issue so you need to know to watch for unusual POST issues if you do it. Yes, I mixed brands in my 768p 7490, but I used two Dell OEM’d modules to help the odds, and I know I need to watch it for issues.Thankfully they started to clamp down on garbage RAM (and better communicate RAM failures, or just block POST with RAM that has no business being used because it’s that bad) with the HSW series (5/6X40, DDR3L required per Intel) and subsequent HSW era AMD laptops due to this crappy RAM causing issues with decreasing tolerances, and got really strict on some of the DDR4 models (Skylake-present) - in some cases, you can’t even mix DDR4 RAM modules with Dell unless the specs are identical! This poor reporting issue is the exact reason (even today!) machines like the 6420/30 still sell, albeit not for much. If you know about this problem and use quality RAM, it often wakes them up and you just got a cheap laptop.Sometimes they’re won through joke bids, but others need the machines and if it has the signs of cheap RAM causing issues some people gamble if it’s not hard to access. Start with the RAM - get a good set of Crucial/Micron (Crucial OEM), or even Kingston and Teamgroup and start there. If you already have multiple modules, pull both and put one in at a time on slot A (lower slot) and see. Some Dell laptops are real particular about using Slot A (sometimes known as Slot 0) first.
