|There is probably NOTHING WRONG with the bios chip, unless this happened after you attempted to flash the bios !|
The flashing leds are probably significant - there may or may not be troubleshooting information about that in your Packard Bell system manual for your model, or in the support info for your model on the Packard Bell web site, or it could be just something your probably defective power supply does.
A cmos battery that is too weak or dead cannot cause your problems.
"the dvd drive does not eject but is connected ok."
If it was working fine before, that probably indicates your power supply is failing and is not provided power to it.
CD or DVD drives only need to have power connected to them when the computer is running in order for them to be able to eject and retract the tray by pressing the button on the front of it.
The led on the front of it should come on briefly when you press the button.
When you insert a disk, the led should come on briefly for a longer time, and the disk should spin at least briefly.
None of those things require a working mboard or a data cable connection, they just require power.
Modern power supplies often have two or more separate +12v output sections - sometimes one of them can malfunction - I answered a Topic recently where he had a brand new power supply that had that problem. His fans and leds worked fine, but none of his drives - hard or DVD - worked . His hard drive activity led did not come on, and no drives were shown as detected in the bios Setup. Desktop CD or DVD drives and desktop hard drives require both +5v and +12v.
Is (are) your hard drive(s) spinning ?
Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:
If you can borrow a power supply from another working computer, try connecting that.
If it is failing, you can usually replace it with any decent quality standard sized standard ATX PS with the same capacity or greater.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Don't buy an el-cheapo (in quality) PS.
See response 3 in this:
We are frequently seeing these days that many people have been adding or upgrading their video cards to one that requires more power than their existing power supply can handle without it being damaged eventually.
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.
If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.