Dell OptiPlex GX620 Error

I just want to ask you guys this here

I'm getting 1 & 3 plus 4 beeps

I have 1GB Sticks in all 4 slots

I know 1 of them is probably bad

If this is occurring during bootup and prior to Windows loading, it's likely a memory problem since that's when memory is checked.

Make sure that, prior to remove or insert memory sticks, you unplug the cable from the Power supply and wait 1/2 a minute.

Sometimes is only a bad contact on the slot.
- detach the power cable from the HDD to make sure it won't boot
- Remove all memory sticks and spray a contact cleaner on the memory contacts and on the slot
- insert one memory stick and start the computer. If it POST normally (no beeps), power off, unplug the cable from the PS and insert another memory stick and start the computer.
- insert one by one memory stick till you find the bad one.

So it might be just dirty in the slots

I tried all 6 RAM Sticks I have, Same thing 3 & 4,

I will try putting 1 stick in a different stot

Don't mix memory types and speeds. The 4 sticks should be same brand and speed.

Ok I have

2x hynix 1GB 2Rx8 PC2-5300U-555-12

2x hynix 512MB 1Rx8 PC2-5300U-555-12

2x Samsung 1GB Rx8 PC2-4200U-444-12

2x Kingston 1GB Rx8 PC2-4200-444-12-B1

2x M 512MB 2Rx8 PC2-4200U-444-11-B0

That's all I have

You said you have 4- 1 GB sticks installed but you list only 3 in your last post.

Also, given the age of your system, they should be DDR 2, not DDR 3. I don't have time to check the specs for all the sticks that you have.

As a suggestion, you might try two 512 sticks or two 1 GB sticks. I'm not sure which slots you need to use when you only have two sticks.